1st = Number 1: I like the dark colours that are used, the colour of his hair is nice and I like the blue colour of the background.
2nd = Number 2: Here I like the enviroment in which the character is. It's a very good work.
3rd = Number 6: The highlight colours match with the dark cape.I like it.
4th = Number 5: It's nice combination of colours but not as great as the others.
5th = Number 3: All the coulours together are quite nice and matces with the character.
6th = Number 4: I believe that the white colour doesn't match with the other colours.