Your asking if you should leave the background those multiple colors right? If so, I would sugest deleting whatever's not part of the head you want in game and making the excess area transparent. This can be done if you are using a program such as gimp, pain.net, or photoshop with the magic wand tool. If you are currently useing a program that dosn't have a magic wand tool, make the excess/area not part of head, one color that is not used in the head's drawing/shading and select the "set transparency" box when uploading it.