Avatar upload is only after the user has activated their account. There is a trac ticket to add this function back but it might not get added.
If you are wanting people to add an avatar when they log in. You can have the user get redirected to the change avatar page. This would have to be coded by you or a developer.
You can add any profile fields to the members-loop.php go into that file and scroll down to this text:
/***
* If you want to show specific profile fields here you can,
* but it’ll add an extra query for each member in the loop
* (only one regardless of the number of fields you show):
*
* bp_member_profile_data( ‘field=the field name’ );
*/
