Replying to New photo critique/help

Now that our ski season is almost done we are starting to break the kayaks out

We were trying to get some night shots and this is what we ended up with

Shot on a Nikon D2X, shot at f/5.0 13 second exposure, ISO at 640? i think, focal length at 34mm

The kayaker is lit up by a person sitting on the rocks to the kayakers right with a speedlight

I like the shot, and think it has potential. I'm looking for critiques, and ways to capture the kayaker better.

Thanks