From the car you could not do much moving around but sun angle is a bit off, might try quick mask in PS to lighten that area. Do like the pose and setting and would go tighter on the crop. I think you are trying to show the thorns in without cutting but would rater see the bird larger in frame.
While doing a smaller crop I'd eliminate the stuff at the ULC. Your BG is primarily very nice and that corner really pollutes the rest of it. Small birds ARE difficult but I think you did the best you could here. Learn from what Al suggested and try again!