Hi Jeremy. I started a new thread under image improvement for these types of images.
I'm gonna jump on that later when I have some more time and I can comment more specifically on each image. Seems like a worthwhile off-shoot from the "traditional" stuff.
The glass filter makes an interesting "thermocline" feel. My preference would be to dial down the density of the filter so it is not so obvious (unless that is what you are going for) and bump up the contrast of the diver to separate it a bit more from the background.
I did a huge number of different variations on this one - including every color under the rainbow. At one point, I was going to do a 3 x 3 matrix of different versions ala Andy Wharhol with some being the inverse of the others. I never found the right combination for that idea. Some looked much better on screen than they did printed and some the other way around ... I found that to get a good print, I had to really dial-up the glass filter. I agree a subtler touch might look better on screen.
The top-most white reflections look pixelated. Is that in your print, or just from knocking it down in jpeg?
When printed, the pixelation disappears and the the gradation of colors is very smooth - at least at 10x10. I can't remember exactly which file I printed ... and there are like 100 different versions in my library.
If you can do this with a "throw-away" image, are you working on other images which are technically correct?
Underwater, not yet. I'm still working on getting "techincally correct" underwater images. 
Above the water, yes. I've been playing a lot with "fake tilt-shift" imagery this year.
Thanks for the encouragement!