Roy-
Those colors look spot on to me! You obviously spent a lot of time masking your camo scheme, there is no apparent overspray or anything ANYWHERE! I can honestly say that I couldn't have done any better myself.
As for the lightening effects I used, I think it may be a bit late for them. However, there are a couple of other ideas that might do the trick to get the look you are after. The way I do it, I spray the base color first (we'll use brown for the example). Then, I mix up a slightly lighter brown color and mist it where I want it. Then, I mask the airframe and spray the next color (green). Then, I make a lighter green and spray that where I want it. Then I remove all of the masks.
Have you ever used pastel chalks? I think they would be just the ticket for lightening the fabric and general filth on the airframe.
Seriously Roy, very well done! She is gonna be a stunner when she's finished.