TUTORIAL
Change WordPress Avatar size
How to Change WordPress Avatar size
So lets get started changing WordPress avatar size.

1. First open up your comments.php which is in your theme.
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<ol class="commentlist"> <?php wp_list_comments(); ?> </ol> |
2. Add 'avatar_size=100'
in between the parenthesis.
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<ol class="commentlist"> <?php wp_list_comments('avatar_size=100'); ?> </ol> |
Change the value to fit the look your going for. I used 100 pixels. More information an WordPress avatars aka Gravatars. http://codex.wordpress.org/Using_Gravatars