not really. I use a limited pallette. For example, cer blu, raw sienna, and indo orange (maybe it's calle perrinone now). With those three colors I can get a wide variety of cools and warms that help me build up the painting. If you "shade" with grey, then the color you put on top of it will be muddy. If you paint on top of bright color, it is more vibrant. This particular piece was not painted in acrylic.
I like this version better. Comics are about artists stylizing the characters and some of your work is just too damn precise and realistic looking.
You're obviously massively skilled as a drawing technician, but I guess I'd like to see you pour more of your effort into the artistic interpretation of the characters and less into making them seeming uber-realistic.
Then again, you're a guy out there getting paid to do this and I'm some hack on deviantart, so take it all with a grain of something or other, know what I mean?
black watercolor is cool. I switched to ink wash out of necessity on FEAR ITSELF: THE HOMEFRONT. The interior paper stock from Marvel quality declined and the black watercolor was too splotchy. I tried ink wash, and got really excited by the results. They were really slick on lower quality paper. It's less forgiving, but that's what is cool about it. If you know what you are doing, you are rewarded with sexy and powerful results.