That is a good looking bird. Exposure looks right on for the bird and snow. If it was possible moving right and up would have gotten the whole bird without obstructions and possibly gotten a more uniform BG.
Robert has offered the suggestion that popped into my mind as soon as I viewed your image. Sometimes in the heat of the action it can be hard to think of BGs and such, but over time it becomes second nature. I don't associate Iran with snow...thanks for presenting us what winter is like over at your end - always something to learn!