Your title caught my eye; my daughter is into skateboarding, and I've been hesitant on how to take 'action' shots such as these. I love what you did here, agree with the comment above. When it comes to movement, whether it's humans or animals, the photo looks best when the viewer can see left to right as to what is taking place, in order to 'convey' that movement. I do like these though. #6 down from the top, is my favorite.
Nice job.