Beautiful image. Personally I don't feel it's too dominant. The backround is beautiful and the snow tells us a time of year. I might add a bit of canvas to the bottom. You were fortunate to capture this quick moving subject at 1/320 sec. Nice job!
While I don't believe it dominates as your dilemma suggests, I think having a smaller bunch would work really well with the small bird. Also if the perch were smaller you could have captured this as a vertical and I feel it would look really nice that way. A wonderful image Rosl. :)
The image is a good composition. The shooting parameters look spot on. I'd be inclined to either add more at the top or bottom; take a little off of the left. ;-)
Lovely shot, I would add a little more canvas to the top or bottom or both - I would have to check! - and this would make the branch look a little less dominant. Great colours detail and exposure