As far as color correction goes, I can tell you from having stared at my screen for hours at a time tweaking things that it's very important to keep as much detail as possible. Your final screeshots look a bit too dark, and you can tell in that shot that Ash posted that the faces of the toops are pretty much gone. You might try raising the gama level and also lowering your saturation a couple of notches.
Great work so far though.
