Hi Nikolai,
I think i would lose the back two rows - they look asleep/not interested/chatting, whatever, so crop them off. I have to say, that it looks to me that the conductor is holding the head of the guy in his left hand, having chopped it off with his baton/sword. Try blurriing that guy into the background a bit, maybe. The three girls to the left - (oboeist's??) - try lightening their faces, to counterbalance the white patches of the music and guy's shirt to the rhs. Or crop the whole image more tightly. To me, it is the relationship between the conductor, and only a few of the orchestra, the three girls I mentioned, but he may be putting the evil eye on the guy's at the back.
Only things to try, if you wish.
Best wishes,
Ray
PS, you forgot the bit of barbed wire fence ;-)