Personally, I don't like the use of celebrity faceclaims. And the more well-known they are, the more put off I am by it. I don't mind photos by any means. I just don't like already having an association to the faceclaim. I also like art pics for faceclaims, and it's usually what I go with in various degrees of realism. The only hard line in the sand that I have is: No anime FCs! (I can't stand anime characters)
BUT, outside of that, I don't like the use of glammy pretty-boy/insta-girl pics. I don't really know how to quickly summarize the "look". But essentially, I greatly dislike character pics that look like they were taken out of GQ or Sports Illustrated. Models that are heavily groomed and made up. Too clean, too fake. And unfortunately, I see these FCs EVERYWHERE. Basically, if your FC looks like a typical model out of a photoshoot, I'm definitely not gonna get excited about it. A lot of the physiques that I see in the Requests by Males, tend to exemplify females of these proportional persuasions that I really have little interest in RPing as. And I'm sure the feeling is mutual when they see the types of FCs that I proposition. But different strokes for different folks, as they say. I just wish that the faceclaims and... bodyclaims? that I find so unappealing weren't so homogenously popular.