Once I saw a drawing,that was made with a lot of colors,for example a face.The face was made with blue,green,purple,orange...So I would like to ask you,what are the rules of this drawing type...I mean I understand that there are cold and hot colors...
Is it possible that cold colors are used at shadowing...and hot colors for lightning?


Can somebody give me a site,link where I can read about this...or maybe sme tutorials...I'm just courios:D