Where the neck curves the shading is backwards compared to the rest of the sprite. For the rest of the sprite your light source is coming from the left but for the curved part of the neck it's coming from the right.
Other than that it looks great. Very awesome design.
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Adarias: The background color is fixed now.
Metalheaded Zombie: Well, I just signed up, so I didnt have time to do much yet.
Lunarknight: I didnt notice that before, thanks. Ill change the shading and add a shadow cast by the head.