Thanks for the replies! Sorry I was unclear--I am not building a physical model. I am doing a profile picture on my computer of Bud Mahurin's P-47D-5-RE, circa January '44. This one:
What would help most is either a web page that has a swatch of the correct color, or better still, a 6 digit hexidecimal color code. Or maybe someone could just tell me... "a little darker" or "a little greener"

, or provide any other criticisms to help me improve its historical accuracy.
Thanks guys!
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Sancho