I like how this looks!
When it comes to repairs, you need to make your highlights comply to the light source, which is in the upper lefthand side of the frame. (Pretend there's a little sun up there)
The highlights have to be more on that side of the pixel, or it'll look pillow shaded.
Also, your current outline is a dark brown. I suggest a darker blackish color. That brown from the sprite doesn't look good as an outline most of the time.
The cake is a lie.