That, and it's a JPEG. Very bad decision. As always stated.
Actually, it appears photobucket has done it again
, if was origionally BMP
Well, that happens for not reading what they offer. It is clearly stated on the site that bmp will be automatically changed into jpg.
Evil? maybe, but they warn you. So, read TOS, FAQs or whatever before signing up to anything

But anyway, BMPs aren't meant to be online.
As for the picture,
AA is pretty much for smoothing your lines. It is more complex than just adding a color on all the edges. If you lean towards the bg, your lines will look broken, and if you lean towards the lines, it will still look jaggy. So you have to find the perfect harmony (to call it somehow) At the same time you have to care about the image not looking blurry. It is more or less like a puzzle.
On yours the AA is random, and the color choice is bad (most of them are too close, and AA and shading do not work properly)
Overalll it is kinda dirty, (like on the mouth, why does it have random black pixels)
Oh also, white is a bad color to AA against.
Anyway to sum it up into a phrase, if you do something, do it for a reason. Don't add random shadows just because, plan where they have to go, Don't AA randomly, just do so on places where you think it needs it (you should check both zoomed and unzoomed versions of your picture to ensure your AA is working properly). Don't kill readability for randomness (unless it is intended)