Looked closely (as always) at your photo in full resolution and couldn't find anything wrong with it. Only after I downloaded, opened it in photoshop at 200% and made it a lot brighter, I saw a strongly pixelated area around your ear and where your hair starts...
One can fix it of course, but I don't know of an easy way. I'd check the original file and most likely start from scratch.
I always need to check that everything looks good in full resolution because I know you are gonna blow them up anyway and inspect all the little detail :D
Looks like the problem is only on Google Chrome, at least on my computer, on Safari everything looks like it should!