Seem fine. If you want me to get nickpickity, there's the tiniest of gaps between your picture and the corners, making the transition from picture to end-of-picture very obvious. But otherwise, fine.
Yeah I was thinking that about filling the whole image. It just looks like a regular avatar rather then a 'rank'. You can't get rid of the classic Rayman pink background!!
The Luchador, the freaky Ly, and the Proto-Ly look good. Though, the Ales and Teensie Damsel in Distress should be two separate ranks. The last Ales rank looks okay, but I can't put my finger on it.