this is a really good photo dude nicely done

The composure of all these photos are really great. However, they are all severely under exposed. If you are using a point n shoot, trying turning up the iso speed. This will introduce noise, but you can remove most of the noise with something like noise ninja.

If you're using an slr, consider a longer shutter speed, more iso, and if all else fails, a quicker lens.

The canon and nikkor 50mm f1.8 lenses go for really cheap right now, and will allow you to work with a quicker shutter while still letting in lots of light.

im no camera expert, but wouldnt a flash be a nice touch? the riders face is blacked out, and its still going to be dark even if more light gets in and all...