For solos, I'd like to see more girls in sexy-but-realistic outfits. For example, real college students generally don't wear schoolgirl costumes, but skirts, tights, crop tops, tight-t-shirts, etc., are all pretty common.
I'd like the girls, before stripping, to spend some time moving around without being 6 inches from the camera. It's pretty much impossible to appreciate their legs otherwise.
I like it when the girls speak to the viewer, but of course not all models would want to do that, or have a talent for that.
For my tastes, the more tattoos, and the more neon-colored-hairdos, the better.
Anyway, good luck!