I like it most when RPers give out a LOT of details. Little things from facial expressions to small hand gestures, or even the simple waggle of an eyebrow is something that can be expanded and elaborated to give a better RP experience.

I also like it when RPers give off a lot of emotion. Happy, sad, amazed, angry, whatever. Also, I think it complements the facial expressions and body language well. I really really like elaborations since it's so much better to interact with stuff like that.

Aaand, I also like it when a LOT of imagination is placed in the post. Like, when there are certain circumstances that didn't actually happen, but might have happened, and are incorporated in the post. I understand this shouldn't dominate the post as it might be associated to godmoding and such, but giving a little something random to talk about never hurt

The post doesn't have to be soooper long. It just needs to be substantially RPable and interactive. ^__^