Shadow/Sun Light Tutorial by Gkan

In video, you’ll see all the action.
This method is difficult and very time-consuming a method.
good luck.

I’ve used programs;

3DsMax 8.0 – 3D Model
Macromedia Fireworks 8 – Texture
Adobe Photoshop CS2 – Texture
BodyPaint 3D 10.1.0.0 – 3D Painting