Nice way of integrating nature into the challenge. It must be hard to replicate the "Polka Dot" patter in nature. I can also imaging that it is difficult to photograph the belly of a bird.
I really would have like to see this a little brighter in exposure...your background although is quite blown out...but what a pretty bird (Woodpecker right)
Coming off to me as heavily backlit and flat looking, I'm afraid. Perhaps some adjustments (such as curves, saturation, contrast) could punch it up a bit but I am not really sure.