What is the difference?
There is a major separation between cell shading and pixel shading. For those who don't know what they are, here are their definitions.

Cell Shading
Cell Shading is shading in the style of what would be found in an animated movie. Typically there are only two shades, the flat color and one shadow color although a third highlight may be used as well. It is often created by sectioning off the shadow and flood filling. It is different from pixel shading because it emulates the animation style as opposed to following pixel techniques such as dithering, anti-aliasing and using a range of shades.


Pixel Shading
Pixel shading is by the use of placing each color pixel by pixel with the exception of the flood tool. Shading such as dithering, anti-aliasing and using a range of shades also are a part of pixel shading to give the artwork depth, texture and style.


Examples - Cell Shading




Examples - Pixel Shading




See the difference now?

For the cell shaded deviations, the category that best suits them is in Misc. since they do not use true pixel shading techniques.

Welcome to Digital Dolls dA
How to Report Doll Miscats
Visual Guide on Different Shading Techniques