How to change commenter profile pic in Laravelista Comments package?

I want to change commenter profile pic when anyone comment or reply on a comment. Here's the image code which is defined in the package blade.

<img class="mr-3" src="https://www.gravatar.com/avatar/{{ md5($comment->commenter->email ?? $comment->guest_email) }}.jpg?s=64" alt="{{ $comment->commenter->name ?? $comment->guest_name }} Avatar">

Here is the comment full blade

@inject('markdown', 'Parsedown')
@php($markdown->setSafeMode(true))

@if(isset($reply) && $reply === true)
  <div id="comment-{{ $comment->id }}" class="media">
@else
  <li id="comment-{{ $comment->id }}" class="media">
@endif

/* User Image */
    <img class="mr-3" src="https://www.gravatar.com/avatar/{{ md5($comment->commenter->email ?? $comment->guest_email) }}.jpg?s=64" alt="{{ $comment->commenter->name ?? $comment->guest_name }} Avatar">
    <div class="col-md-8" style="margin-top:8px;"><h5>{!! $markdown->line($comment->comment) !!}</h5></div>
    <div class="col-md-3">
        <div style="margin-top:8px;">
        @can('reply-to-comment', $comment)  
            <button data-toggle="modal" data-target="#reply-modal-{{ $comment->id }}" class="btn btn-sm btn-link text-uppercase">{!!Lang::get('site_lang.reply')!!}</button>
        @endcan
        @can('edit-comment', $comment)
            <button data-toggle="modal" data-target="#comment-modal-{{ $comment->id }}" class="btn btn-sm btn-link text-uppercase">{!!Lang::get('site_lang.edit')!!}</button>
        @endcan
        @can('delete-comment', $comment)
            <a href="{{ url('comments/' . $comment->id) }}" onclick="event.preventDefault();document.getElementById('comment-delete-form-{{ $comment->id }}').submit();" class="btn btn-sm btn-link text-danger text-uppercase">{!!Lang::get('site_lang.delete')!!}</a>
            <form id="comment-delete-form-{{ $comment->id }}" action="{{ url('comments/' . $comment->id) }}" method="POST" style="display: none;">
                @method('DELETE')
                @csrf
            </form>
        @endcan
    </div>
</div>
    </div>


    <div class="media-body">
        <h5 class="mt-0 mb-1">{{ $comment->commenter->name ?? $comment->guest_name }} <small class="text-muted">- {{ $comment->created_at->diffForHumans() }}</small></h5>
        {{-- <div style="white-space: pre-wrap;">{!! $markdown->line($comment->comment) !!}</div> --}}


        @can('edit-comment', $comment)
            <div class="modal fade" id="comment-modal-{{ $comment->id }}" tabindex="-1" role="dialog">
                <div class="modal-dialog" role="document">
                    <div class="modal-content">
                        <form method="POST" action="{{ url('comments/' . $comment->id) }}">
                            @method('PUT')
                            @csrf
                            <div class="modal-header">
                                <h5 class="modal-title">Edit Comment</h5>
                                <button type="button" class="close" data-dismiss="modal">
                                <span>&times;</span>
                                </button>
                            </div>
                            <div class="modal-body">
                                <div class="form-group">
                                    <label for="message">Update your message here:</label>
                                    <textarea required class="form-control" name="message" rows="3">{{ $comment->comment }}</textarea>
                                    <small class="form-text text-muted"><a target="_blank" href="https://help.github.com/articles/basic-writing-and-formatting-syntax">Markdown</a> cheatsheet.</small>
                                </div>
                            </div>
                            <div class="modal-footer">
                                <button type="button" class="btn btn-sm btn-outline-secondary text-uppercase" data-dismiss="modal">{!!Lang::get('site_lang.cancel')!!}</button>
                                <button type="submit" class="btn btn-sm btn-outline-success text-uppercase">Update</button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        @endcan

        @can('reply-to-comment', $comment)
            <div class="modal fade" id="reply-modal-{{ $comment->id }}" tabindex="-1" role="dialog">
                <div class="modal-dialog" role="document">
                    <div class="modal-content">
                        <form method="POST" action="{{ url('comments/' . $comment->id) }}">
                            @csrf
                            <div class="modal-header">
                                <h5 class="modal-title">Reply to Comment</h5>
                                <button type="button" class="close" data-dismiss="modal">
                                <span>&times;</span>
                                </button>
                            </div>
                            <div class="modal-body">
                                <div class="form-group">
                                    <label for="message">{!!Lang::get('site_lang.enter_message')!!}:</label>
                                    <textarea required class="form-control" name="message" rows="3"></textarea>
                                    <small class="form-text text-muted"><a target="_blank" href="https://help.github.com/articles/basic-writing-and-formatting-syntax">Markdown</a> cheatsheet.</small>
                                </div>
                            </div>
                            <div class="modal-footer">
                                <button type="button" class="btn btn-sm btn-outline-secondary text-uppercase" data-dismiss="modal">{!!Lang::get('site_lang.cancel')!!}</button>
                                <button type="submit" class="btn btn-sm btn-outline-success text-uppercase">{!!Lang::get('site_lang.reply')!!}</button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        @endcan

        <br />{{-- Margin bottom --}}

        {{-- Recursion for children --}}
        @if($grouped_comments->has($comment->id))
            @foreach($grouped_comments[$comment->id] as $child)
                @include('comments::_comment', [
                    'comment' => $child,
                    'reply' => true,
                    'grouped_comments' => $grouped_comments
                ])
            @endforeach
        @endif

    </div>
@if(isset($reply) && $reply === true)
  </div>
@else
  </li>
@endif```