Thanks guys. I knew from the beginning that it wasn't going to match the painterly style they are using but I still wanted to give it a touch of realism to my soldiers. Perhaps when I'm done doing the portraits I could expand into making the uniforms / backgrounds more realistic, but it's not something I'm too worried for now. The portraits themselves actually do blend in pretty well in-game.
The only little thing I'm worried about is the skin tones on some of the Black portraits not matching the hands to which I'm thinking about giving them gloves.
@Cspruce - Thanks, man. I really hope people get to enjoy the game from my point of view once it's done. Also, the other day I saw your Marine Edition mod and it gave me the push I needed to get back on track and get this done...so thanks again.