Careful with perspective and proportions! Dude's elbow doesn't really look like it's leaning on the desk, and he's got awfully thin limbs for having such a wide torso (kinda looks like JAAAAMES doodled out yer guidelines HAR HAR!). The chicky with the creamy-smooth backside is also having the same problem with her skinny skinny arms, and her foot doesn't look very comfortable at all (not to mention her other foot is missing! =O).
I do love how the scene is made up, though. It tells a good story. Just gotta be less sloppy! =O