No, there is many tutorial on the internet (Especially on DeviantArt). What I think is the best to do is to pick up some technics from the others in order to create your own. The hardest is to find the technics you prefer. First step is to improve the line drawing (Perspective, proportions, movements, expressions...), secondly invest in a good old Tablet (wacom's are good), lastly trying plenty of painting technics... The main rule is to hear the critics and allways find challenges !
In fact, most of the outclassed soviet fighters had little to no chance of defeating the more advanced and well-crewed German machines, and many were thus destroyed. It was this fact that eventually lead to the taran atctics of ramming the German airplanes, because normal dogfight couldn't be won in normal ways.
Eventually, the soviets managed to get better fighters, but the initial German onslaught left a bitter taste in their mouths.
Glad ot see that you keep ilustrating great moments of WW2. Keep the wonderful work.
It the end, in fact, the soviets did managed to push the Germans back.
About the killscores, as Vass said ,there were a lot of factors. The Western Allies had the chance of pulling their aces back to train newer pilots, while other nations (like the soviet) didn't had such a chance and just kept their pilots flying until they were dead, incapacited, or the war was finally over.
- not criticizing anything of coruse. The fact remains that desperate times require desperate measures -