blah blah blah
also if anyone who can actually skateboard well could give me some crits on the stance that would be rad.

:]

I think the most obvious thin I can point out is the skateboard, it looks like something from the early 90s. The most common shape is a symmetrical round nose/tail. While the tail/nose do "pop" up a little they aren't that exaggerated, they also "pop" the same height.
When you skateboard you kick/pump more than you just glide. Might want to have him constantly kicking/pumping, otherwise the speed won't make sense. He'd jump on the skateboard move a couple meters and then he wouldn't be going anywhere.It might be beneficial for you to watch some skate videos. Even though they're mostly about the tricks you'll see that they're almost always crouched unless there's a cute girl around or they want to look cool. That's how it was for me at least. So bend them knees.
The knees shouldn't be pointing backward either. Not that much at least. His knee would be pointing at us/the camera. The front leg would undoubtedly be pointing forward.


I hope this helps. :]