I like the first one a lot. I would just say shoot more and get more vairations of angles. When I posted bmx shots, everyone said I was too far away...but thats my preference to show perspective...so i learned some people like the in your face shots. I dont think there is anything wrong with these two though.
I shoot a lot at a cement park similar to this and I always find that the shots are kind of boring becuase of all the dull tone from the cement....searching for a way to get these kind of images to pop more and I think off camera flash is the only way to do that.
Thanks for the comments guys... Yeah, I flash would have been nice. These were taken using natural light. The built in flash and the flashboot on my D60 aren't functional. I have since acquired a better, fully functional camera. But, the 17-35mm I used for these shots broke. So currently my widest lens is 28mm... Which just doesn't quite cut it for this stuff.
People do like in your face action... Shooting a sport like bmx I think you have to have in your face action in the photos for people to really appreciate them, unless you're showing other riders a "spot" in which case you'd want to show more perspective. People who don't ride don't see a location the same way as a bmxer does, therefore you present them with a tighter framed image that shows the apex of the trick or the facial expression of the rider.