
See the link:
http://www.youtube.com/watch?v=fZUIFSeLbiI
Unlike most other modern fighting games with strong 3D simulating reality scenes, ST IV adopts non-photorealistic rendering, a visual effect similar to what we photoshopers ofter refer to as cel-shading, or toon-shading, which is to simulate live-art, graphic style by computer. See the comparison between Photorealistic style and cel-shading below:

Cel-shading: Street Fighter 4's simulation to hand-drawn effect.