Thank you for the reply, pauljs75.

You are right with everything...  But it's not the lighting that bothers me, actually...
What I really can't do are those little so-to-say (fish) scales:

http://walkarounds.airforce.ru/avia.../vf_i-16_71.JPG

I really hoped you could point me at some trick how to make them... Maybe with some texture/filter I just don't know about yet...

P.S.: there's no point in tinkering with lightning/shading since this aviasim (Forgotten Battles) uses 10 years old engine so it doesn't support self-shading or anything... Unfortunately...