True A_dave - perfection is something that is worth striving for.
BUT, I think there is such thing as being to pedantic. Many people won't notice flaws that seem obvious to us photographers. I went and read a few old surfing magazines the other day (dated well before my increased interest in photog.), and the pics that I thought were perfect before my knowlegde had increased had so many issues. Pixelation from images being printed too large, non-sharp images, images with stacks of uncorrected coma and chromatic ab., back focusing. Even a pic poster sequence were in one of the shots the focus was terrible - full blur. These are pros in the mid to late 90's. I am quite sure that pros aren't any better now than then.
Point being I never noticed an issue from my untrained eye, and these photographers were paid for what they shot. And I absolutely had stared at these pictures for days.
Surfing is something though, that is a little less concerned about technical perfection than, for instance, architectural photography or food photography... So I guess what I am saying is that it depends on your target market. Surfers won't really care, but precise architect types will get out the microscope.
If photography is a hobby where the main person you satisfy is yourself, then be as critical as you like, and become a perfectionist. My point about the original picture is I think for what it is, it is great post processing. To be honest when I first saw the pic I wasn't fussed with the brighter background, the main focal point was still the face.
Still, I appreciate the image was posted for suggestions to improve, and all suggestions are entirely valid.
Just don't begin an obsessive compulsive disorder, they are not cool, unless you are into that kind of thing.
I rant and I talk in circles. Good fun through when waiting for rain to stop to get back outside and paint a wall.