Pardon me if I have mentioned this before ( I may have, but cant be sure without trawling the who thread) but have you considered replacing the dark (black?) shadowed areas with a multiplied version of the solid colour in this case yellow?
FWIW. I think that the dark line running along the top of the fuselage is a bit to strong and the tone in the lower parts representing shape has muddied the colour somewhat.
Black version is looking sweet though.