I just flipped through the series on your flickr stream. Looks like it was a fun shoot, but I doubt the dress survived the water!
As for this particular shot? I agree with Elay about the crop, and I think it's a touch tilted clockwise, so if you're cropping and leave any of the horizon you should straighten that out.
You did a nice job with the speedlight. It seems well balanced with the ambient light to bring her out as the subject and expose well for the background. I would have also have liked to see one with a wider aperture for narrower DOF, but I can't promise it would be better -- just different.
Looking through the others, I particularly like 0068, which seems like the exact same spot as this one but more zoomed in. I also think 0042 is a great shot. Love the mask.
EDIT: It appears I was typing at the same time as Nicole and Elay. I guess great minds think alike?
Elay makes a great point about the gloves, I hadn't thought of that.