Watch out for banding when you pixel. Banding is when segments of different colours align perfectly, causing the impression of gradiented blocks, like this. It makes your work look very blocky.
You also seem to be pillow-shading, another common mistake in pixel art. Pillow-shading is when you add shadows around the edges of the object, rather than thinking about the light source and shading according to where the shadows would actually be. It makes the objects look flat.
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Watch out for banding when you pixel. Banding is when segments of different colours align perfectly, causing the impression of gradiented blocks, like this. It makes your work look very blocky.
You also seem to be pillow-shading, another common mistake in pixel art. Pillow-shading is when you add shadows around the edges of the object, rather than thinking about the light source and shading according to where the shadows would actually be. It makes the objects look flat.