It's was a standard Fw190 colour scheme (RLM 74/75) on top when it left the factory but has received some adjustment later. There has been an overspray of a light colour,probably the underside colour RLM 76. Mottling like this is best done with an
airbrush and takes a bit of practice.
Dahl was filmed for the "Deutsche Wochenshau",a German version of our Pathe news, in this aircraft,in December 1944 and I've got a couple of stills from that somewhere which I'll post in a bit.
Cheers
Steve
Here you go. This will give a better idea of the effect you are after.
These are on my HD but probably from Rodeicke's "Focke-Wulf 190 Jagdflugzeug".
This is a similar kind of mottle on one of my Bf109 models.
Cheers
Steve