Very nice Dan!
The high-key approach works very well here, and exposure, sharpness, subject pose and perch are in all respects excellent.
My main suggestion would be to crop a bit off the bottom, perhaps to just above the lowest bud, because IMO the great length of the perch dominates the image a bit too much. That would put the bird's head and eye more closely in compliance with the rule-of-thirds.
As a minor second point, there is a white spot immediately below the bird's foot that I would clone out. Small though it is, it catches my eye.
But over all, very well done!
Norm