Is the colors that strange? I personally don't feel anything wrong with it - I'm pretty much familiar with it, since I did the skin for Josef Priller's last Fw190D-9.
Our D-9(unfinished version, but a clear color profile)
The real D-13
Profile drawing of the D-13
The RLM colors on the D-13 is a little bit brighter than the version I've used in Priller's D-9, but my choice of colors are from people who build plastic models. If such colors are ever exposed to real sunlight, I think iit's very possible that it may look like that in the real D-13.