The composition is a little bland, but I'm not complaining... You don't see me out there in the water shooting this.
I think you should experiment with a few differnt crops to see if you can improve the composition. Also, post it a bit smaller... It's hard to appreciate the image when I have to scroll up and down to see it all. Plus, I'm viewing this on a 24" monitor, so the image is definitely excessively large.
I'd look at what crop... just moving the screen sixe to faux crop it I think I'd like it more without the sun fully in there.
Sun just comming into frame at top left of the crop and around about 4x6
I agree with Anthony I think if you crop just slightly above the middle towards the bottom right. .The whole sun is extremely distracting but I think this shot could be absolutely amazing with the right crop.
That does look better. Maybe just a shot of it in the air. I played around with some crops of it and to me it seems that it is best in a landscape orientation cropped to include the flare off the board and just a tiny corner of the sun in it.
As photo goes it's pretty good, the sunlight reflecting off the board and catching the water is pretty cool.
Looking at it critically as 'kiteboarding' photo, I think it is lacking in composition, you can't tell if the kiter is hooked-in or unhooked (which is a big deal in kiteing) and the kite is flying upwards not forward (again a big deal in kiteing). Those are very technical aspects of kiteing that make a big different to the riding experence and hence to the images that portray the sport, sorry I can't explain it better, it's a kiter thing.
If you get a chance to flick through a kiteboarding magazine you'll see that majority of the ads and photo galleries will have a clearly unhooked rider with kite flying forward.
Still a great photo. Hope you didn't get your gear wet.