Good question, but it comes down to individual preference really.
Style is everything. I personally like to see excellent lighting and picture quality- a blending of amateur and professional photography so that it still looks "real". I hate seeing gorgeous models in 1980's blur/fuzz fantasy shit.
I absolutely HATE teaser sets/sights... I'm here for the PUSSY! I like to see it from any angle, the more imagination the better- spread, gaping, whatever.
As long as the model is decent looking, and shaved (few exceptions), good photography of her pussy will get my rocks off. I am married so I am not looking for that dream babe, I just want to see pussy, preferrably nice pussy in high quality with good lighting.