I suspect that most of the comments about quality all boil down to having to zoooooooooooom, right? :)
Because, knowing where that was shot, I suspect he was in one of those trees on the land side, not peninsula side? I've taken eagle shots down there that ended up almost exactly the same!
I still like it though... it's not easy to get a good shot of these ugly mugs :D
Looks to be a overworked JPEG. When working in JPEG you need to make your adjustments, resize and save in as few steps as possible ( I try to do it in one step). Every time you open and close a JPEG it looses information.