Hi Konstantin.
An excellent little scene IMHO and the presentation looks natural.
My only areas of critique are...
1) The seated figure's right forearm looks to be broken... Where it drops to allow the hand to rest on his rifle looks from the photo to be behind the wrist joint.
2) Perhaps a variation in the colour of their neckerchiefs would have looked better.
I know these points sound very "picky", they're just the two things that seem to look slightly odd to my eye and are intended to be consructive. I only wish I could come close to matching your brushwork!
Richard.