Whoa! Lines are so jaggy, but I can't blame ya. Though it's because you're using older photoshops and only CS+ have the vector outlines you'll need. :o You need a pen tool or use an Illustrator. -^^-
I really love the background here because it's so flowy. Though about the colors on Riku well it seems more painted not that I would consider vectored actually sorry. ^_^'