Keep in mine that when airbrushing matiral it sometimes does not stay the way you airbrushed after the first washing, it will fade. Also you need to heat set the paint real good, and make sure you use the right airbrush paint. You'll just be wasteing you time if not.
You guys are on the right track with the Russian camo idea, if you can get some, use a dark brown or dark green dye but do not use the whole box or bottle, make it weak using less so it does not over power the camo to much.
Keep up the great work guys.