I was looking through some unprocessed shots from October 2008 the same day I saw a reference to the use of luminosity masks in Photoshop. It was a great coincidence. If you don't know about luminosity masking, here's a good reference -- http://goodlight.us/writing/tutorials.html (Tony Kuyper Photography)
Chincoteague National Wildlife Refuge, VA, 11:35am
100 ISO, 1/400 sec, f/8, 34mm
single exposure saved as-shot, -1EV, and-2EV in Adobe Camera Raw and processed in Photomatix
Topaz Simplify -- preset based on BuzSim but with less saturation and other modifications (layer visibility later turned off)
Snap Art -- Color, Pencil Portrait, 100% opacity. This is the source of many of the colors in the ocean.
Snap Art -- Stylize, Line Art, Small Features, based on Topaz layer, used at low opacity. This is the source of the gray partial outlines in most of the image.
Levels
Photo Filter (Underwater) -- lowered opacity and masked to affect only the water
Gradient Vignette -- very low opacity
When all that was done, there were distracting dark areas in the clouds in the upper right corner. (I'm going to post an image, below.) Before allowing myself nearly enough time to really learn about the fine points of luminosity masking, I used it to lighten those areas. There are two keys -- a layer filled with 50% gray and blended with Soft Light, and a luminosity mask based on the brightness levels in the RGB channel. Once those things were in place, I simply painted over the dark areas I wanted to lighten with a reduced-opacity white brush. Using Soft Light prevented it from lightening anything already less than 50% gray, so it wasn't at all tedious. Tony Kuyper explains it much better than I am.









