Looking at the photos, the thing that stikes me (and that I would try hardest to replicate) is the dramatic difference between the gleaming fuselage, the bright yellow tail, and the dark olive drab. I think that you've done a good job of keeping that level of contrast in the skin and, having decided to apply heavyish panel lines and weathering on the wings for scale effect, I think that you've darkened the fuselage just about right.