Well, tastes are personal. I happen to prefer (by a wide margin) darked and more well marked assholes.
Here are two more images I played with:
The Asian girl has just had some black coloring added to her anus, and just the textured area around the anus. The blond girl had the color saturation around her holes increased in one image, and some red tint added in the other. For me, all the manipulations led to huge improvements. The blonde looks to have been used more intensively, and Asian just looks better. The darkened anus on the Asian just catches the eye better.