This poster is a school project. The task was to pick a sentence and build a poster around it.
In my case, I played a bit with the words and the meaning. Actually, the poster has several messages. First of all, the sad look on the girl who is driving a car key gives the message that the key alone is not enough when you want to drive a car – you also need the car. Secondly, the girl is driving through an O which is in CMYK colors. Why? – Because Key is the last color in the CMYK color model – Cyan, Magenta, Yellow, Key. So the key alone is not enough – sometimes you need to add a splash of color to make it pop.