To tell you the truth, most of the 109s and 190s I've skinned are all 'guesswork' when it comes to upper wing camo. It's frickin' hard to find such reference on the net, and being thousands of miles away from the West, I have to wait for months to order a book and pay a looooot of money to have it delivered overseas.
Basically, most LW aircraft follow a simple two-tone pattern. In 90%+ of the cases the upper wing camo is comprised of the same colors used on the fuselage. The fuselage usually consists of two~three RLM colors, with the basic 'undercoat' of 'pale blue/green', a bit darker grey/green, and a darkest brown/grey/near-black tone. The latter two colors are which consists the upperwing camo colors.
The pattern is usually very simple. No mottling, just big wide stripes of the darkest color over a basic 'undercoat' of the ligher grey/green colors.
The only thing you have to watch out is the different forms of the Balkenkreuz(the nationality crosses) used on the upper and under sides of the wings - since the LW used different markings according to timeline.
