I really like what you tried to do with number one. It turned out pretty well, but if the skater was more in focused it'd really have been an awesome shot. But it was a really interesting approach, and that's how you end up with amazing shots, is by doing something new.
I like number two the best, I don't really know what you should change, if anything.
I don't like number three, it's too distracting with all the things in the background.
But you definitely made some interesting work, and I applaud you for that. I'm very interested to see what you come up with, because I think you have a good creative vision and I think you can definitely make very, very interesting and creative work.