Hi Ilija
Agree with Manos regarding pose and eye contact. What I think you could do is crop the light areas from the top and burn the bright areas on the wall. What do you think mate? Do these sing as beautifully as the Skylarks?
Love the raised crest feathers and the alert pose. Exposure and sharpness are excellent. I might darken the BG a bit and crop a little tighter on the bird.