Orel you need glasses, Drozdovsky has the epaulettes of a major-general on that picture, you can clearly see the zig zags and two stars. Also as you can see on his medals, he wears the Order of St. George 4th degree, which was given to him in 1917. Rank doesn't even matter because you can not see the epaulettes on the new improved portrait.
Rank of a Imperial Russian Major-General
Also the Markov picture we have now is fine.
We have already found a good quality photo of Krasnov. The one currently in use is from the second world war.
Currently Used in the Game, from the second world war. He is much older and has a white beard.
General of the Cavalry and Ataman of the Don Cossacks Pyotr Krasnov, from the time of the civil war.
Rank of a Imperial Russian General
Also known as wis on the paradox forums.