3. Ummm disagree here. I have Crandall's excellent 2 volume set on the Dora, and from what I can discern via reading and reference photos the wings were painted separately and sometimes at a different factory. The reference photos show no overspray onto the fuselage.
Yes. I am aware of how the real aircraft were manufactured. My suggestion was based purely on attempting to blend the wings into the fuselage without the stark transition. Unlike the other 190's 3D models, the wings of the AH Dora join the fuselage exactly where the fairing ended on the real aircraft. On the others, One could draw the upper portion of the fairing on the fuselage and give it the proper step at the join. Perhaps the smoke can help blend the two parts together. Or maybe you could add the upper lip of the wing fairing to the fuselage.
As making colors look right, the late war colors are very hard to find good reference on and they all are widely different anyway - probably due to great variance in the actual paint. Making it look right is all you can do, and good luck to anyone trying to prove you wrong.
BTW does Crandall mention the colors used on the first production Doras? I've heard of some examples using the 3-tone gray scheme, RLM 74,75,76; or subbing Olivegrun 81 for Graugrun 74. I wonder if this plane would have actually been like that given this plane was the first delivered to a combat unit. I personally prefer the greens you have, but you might want to experiment with other combinations based on the earlier day fighter standard. Just food for thought.