To get user’s avatars of the UM plugin, you have to do this :
// Returns a given user's avatar
um_get_user_avatar_url( $user_id = '', $size="96" )
To get user’s avatars of the UM plugin, you have to do this :
// Returns a given user's avatar
um_get_user_avatar_url( $user_id = '', $size="96" )