I like the original a lot better. In the HDR it seems as if the skateboarder standing over on the right side got all miscolored and such. Composition is pretty good. I think if you shifted a tiny bit to the right to get a little bit of the face of the ramp maybe it would look a little better. The more I look at it the more I'm thinking it's a tiny bit crooked. I can just see those houses way out and the horizon line looks a little off. I'm not sure though so don't hold me to that.
Definitely loving the colors though the ramp looks so vivid, but not over the top. Great job capturing the moment too. Exposure wise, everything looks great to me. I'm not noticing any problems with exposure as it seems your setting were alright. I really like this photo. Keep shooting, and remember photography is subjective so someone may think it's the greatest shot ever, someone else might hate it. Great work!