james, you asked for critique, so ill let you have it
i think you should take an iron to the background and tighten it to remove the wrinkles. i noticed that right away. maybe try lighting it from the back with a colored light to give a sunset look or something??? Pic 1 her head looks huge, pic 2 her legs little big proportionaly (expected with the water magnifying it though). Also on the underwater shots, they look a little over exposed on my camera. Did you use a diffuser on the strobes?
This is just an amatuers opinions though!
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http://www.justinunderwater.com/
-5Dmk2, Sig 15mm f/2.8, 17-40 f/4L, Tam 28-75 f/2.8, 50 f/1.8, 100 f/2.8, 70-200L f/2.8 IS, 1.4x Tele, and 580EX
-Ikelite underwater housing for 5Dmk2 w/ dual Ikelite DS-125 Strobes