Well it depends how you say it.
If you say "NICE ASS!" It comes off as perv. If you're like "I like how you drew her butt, it's very proportional" it comes off more as you appreciate the art.
Lol! I love how we are having this conversation.
So I shouldn't say, "Holy hell, you got fly ears, Cheerilee!"
I should say, "Cheerilee's ears are nicely proportionate to the rest of her head."