Trying HDR on a single image...

Although not a true HDR, I attempted the technique using a single
image of my daughter swimming.

The original RAW image presented some challenges in itself; taken
indoors under artificial lighting and a higher than desired ISO of
1000.

Through Lightroom I made three identical images altering the exposure
by +1 and -1. Then merged them together using the Photomatix plugin. I
did a little hue and saturation adjustments to bring the water to a
clear blue. Not sure I did it right; but I think the result is an
improvement over the original.

Please provide comments.