I agree with the guys here: colours aren´t that bad. I think that the FX
shot is nice. Maybe slightly oversharpened in places, but still good. The UPS 757 on the first post is more noticeably oversharpened: check out the titles and the transition between black and yellow in the fuselage. Flaps and fin are a bit over-done as well.
On your last post I can´t make the difference between both shots. Maybe the colour configuration? Looks like the second one is "less red" than the first one. Am I right? Anyway, the same comment regarding the sharpening applies here, I´m afraid. I´m sure with some selective sharpening you´ll have these issues solved.
Good luck with them.
"Faithless is he that says farewell when the road darkens." J.R.R. Tolkien