You can only have one avatar at a time. If thats an SMF For Free forum, you will have to add a custom profile field and add it that way. (the first image - and possible both because it could al be one image - is actually their member rank). The avatar shows up farther down under the post count
.
Read through this topic - Roswenth has explained how you can add another image to someones profile but it wont show up exactly under their avatar.
http://www.smfsupport.com/support/guides_and_tutorials/a_good_way_to_make_a_reward_system-t3538.0.html;msg22320;topicseen#msg22320Another option would be to create one graphic with both those images and using it as the Rank Image for that group