Sounds like a difficult subject to get in the open so congrats on getting a clean image of it. Quite sharp for the slow SS (tripod, I assume?). I like the comp as is, I don't find it centered as there is much more room in front than behind (as it should). I do wish for a better head angle, and some fill (if allowed) would have been great here.
Pittas are such tough birds to photograph but you did well here. Sharp at such a slow shutter speed. I agree on the head angle. I also feel the perch is overpowering but there's not much you can do about it.