I know I'm reviving this thread but I thought of something...
On the armor parts, you can clearly see 4 different colors.
Starting from bottom and up :
1-silver
2-yellow
3-light green
4-darker green
My guess is that the armor was originaly yellow (as per the Holiday special) and was painted light green, then immediately darker green. Hence not much light green showing through.
On the helmet, if we look at the ESB version, you can see many different colors but here is how I think the helmet should look like before repainting (another guess would be that the blue holiday special helmet was discarded and/or replaced)
Bottom all-around is pretty much silver so my guess it that is the color of the material. The gray color would most probably be a primer applied before the paint.
Dome :
1-silver
2-gray
3-light green
Mandibles :
1-silver
2-gray
3-red/maroon
Upper cheeks :
1-silver
2-black
Lower cheeks :
1-silver
2-gray
3-light green
Left ear :
1-red
2-light gray
3-grass green
Right ear :
1-silver
2-sand camo
Back :
1-silver
2-very light gray
3-sand camo
4-dark green
So my guess would be that the first paintjob this helmet had was :
Dome : Light green
Mandibles : Red-maroon
Upper cheeks : Black
Lower cheeks : Light green
Left ear : Grass green
Right ear : Sand camo
Back : Sand camo
If gray is not primer then it would be all gray except for the back (sand camo), right ear (sand camo) and upper cheeks (black).
Here is what I think it might have looked like with the mandomaker application :