There is just something about medium layered hairstyles that just scream sexiness, and the best part is, anybody can pull this particular style off no matter what shape their face is. This... next picture

...particular style is a perfect blend of colours, and to me that works much better than a single colour, although that's not to say there is anything wrong with the other type. If you are looking for something a bit more casual that can also allow you to look great of the evening, then this is the one that you want.