Genre is ruled by whims. 
Complexity is typically advanced, but not demanding it be high levels of that. 
We're fond of quality over quantity, so if you achieve a lot with two paragraphs, then we won't demand you write 5+ paragraphs.
Images that do not fit the setting, like those images of Female Sith who for some reason appear to be dressed in swimsuit armor or somesuch other unrealistic "clothing" annoy us a lot. Same goes for names that do not fit the setting/species/gender.

More often than not, anime-style images do not fit the setting in the RPs we partake. They tend to have abnormal body proportions, clothing that is illogical and/or hair that far beyond what any normal being could grow. No, no matter what you or others might think, females of the human species do not have larger eyes than the males.

We're also fond of complexity. Our current RP is Star Wars-themed and has about 15 players (of which 3 are GMs).