Im currently modeling a 3D Character in Blender. Im learning from a Video Tutorial Serires of Darrin Lile on Youtube, because im a total Blender Noob. I finished the surface of my Character using Planes. But now half if my Blender figure is covered in Shadows/Dark (?). Its really hard to describe that, especially when youre not a native speaker so here are some screenshots.

PLS HELP. Thank you :D