I like the pose and BG and would increase the contrast. I would also remove the piece hanging from the perch in the lower right. The blacks look a bit noisy.
Good, unusual pose for this species, Jon. As you state it was in your back garden, isn't it about time you changed the perch? - it looks rather well used and worn! I like the graduation in the BG.
Ok guys you don't like the perch that's OK- the intention was that it portrayed the fact that the woodpecker had been tearing it to bits in search of food - hence the loose bit.