Mood- and colorboard done!

This is my idea for future cellphones. My research showed that what people (16-18 year olds) want is a black/white cellphone but with something more personal. So i thought why not have an illustration on the backside to make it more unique? The feeling i wanne create is the personal touch and unique style every individal have and want. The color is going to work for girls and boys and all season. I didn't want too strong colors and only as details for a more discrete look.