That's basically flat out bull shit, in many cases with large Latina or black girl asses there is cellulite because in order to protrude whilst in a tight suit, they have to be much larger whilst not in a tight suit, and that means they sag with fat.
I think you've got a nice ass, and yes I am a bit of a ass freak, it's just that some of us like it's subtle and not jiggling like a fat woman, seriously, NO FAT CHICKS.
You're the best Zero Suit Samus cosplayer I've seen! Sure you have a nice butt (and you know it, otherwise you wouldn't make such a costume) but your overall look is also very much like Samus. Face, hair, body shape etc.
Your butt look a lot more toned than Samus's butt does in Zero Mission though (she actually has quite the plump booty). Still, it would be interesting to compare the two, side by side if you did the same pose.