Kind of like what you were going for in number one, but I think it's too much back-light for my taste.
#2 Looks a touch under-exposed to me.
#3 Not bad. I go back and forth about whether I like the second rider in the background watching. Have you tried it with him cropped out to see what it looks like?
#4 Has a ton of potential -- however, I think you just missed. His heel is clipped on the right side of the frame -- not to mention a good portion of the board. I really don't like the power lines -- and while I know it's part of the urban setting, I find them particularly distracting. Same can be said for the random black blob from the leaves in the upper right portion of the frame. Think this shot has a TON of potential, but it's not quite there yet.
Shoot it again. I'm sure your friends won't mind an excuse to ride again.
