The wp_list_comments function has a parameter to change the default (48px) size to anywhere between 0 and 80px.
wp_list_comments('avatar_size=80');
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Ovidiu Purdea, WordPress Webmaster and SEO & SEM specialist with over 9 years experience in this field. Guru using, modifying, adapting websites based on WordPress. You can follow Ovidiu Purdea on my Google+ profile.
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