Twitter user ujr50138 has uploaded some images showing how photos can be turned into anime stills, thanks to the power of Photoshop. These effects can be achieved by lowering the brightness, but increasing the contrast and adding in blue shadows to show reflected light. Adding in yellow-green and blue highlights to vegetation also helps give images an anime-like feel.
[Images: ujr50138] All of this seems easier said than done!
[GIF via ujr50138]