For some, I suppose the "space to the right" is not ideal
As I have been told "think about it when you take the shot"
If it was intentioned, which I would suspect it was, then it is just a matter of preference
Then there is 16 x 9 versus 2 x 3 - again the composition may dictate this - and you do not get that much time anyway, especially if you are very near and the bird almost fills the frame.
Typical Goldfinch "look" - the colours are good, the blacks are dominant but then they are on the bird in nature - maybe a little too much in the tail if you want to bring out some feather detail
It looks as if it was taken in a low light situation - but it can not have been looking at the camera settings - did you use an off camera fill in flash? - also maybe indicated by the flat edge of the trunk, rather than a "roundness"
There is a small piece of something on the birds beak which could distract on close examination and the small feather around the nape could be cloned out
I suppose f5 does blur the tree detail - but it is still not too pleasant, (for me), and it could be said by some that the tree trunk does not blend with either the bird nor the background…. the twig also does not suit the tree (trunk) ……..?
The beak also has a blown highlight which distracts from the sharpness
IMHO it is a very good shot of the bird, with one or two provisos, but the tree trunk does nothing for the overall image and I'm not a fan of 16 x 9 for such close shots