I guess, the shadow of the nose doesn't fit because it's colour is different to the shadow of the chin.

What does developers documentation mean?
Is it an ingame shot? Looks impressingly good then.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt