Honestly, style of line art, coloring, shading, etc. Then I start to consider the actual subject. Something could match all my fetishes but I won't give a damn if I think the art is bad.

Personally i always look at their feet first. If ahe is barefoot i straight away imagine suckung on her toes. If she has something on,ie tights, socks or shoes i imagine pullung them off with my teeth first. However if she has her ass facing towards the shot and her cheeks are spread, i imagine sticking my tongue in her bumhole and licking her out. Ps i only really look at the pokemon hentai on here, but i delve into emma watson from time to time too

First i judge how well a job it arouses me, then i decide if its good enough to add to my favorites.