Realllllllly nice. I love the contrast of the characters colors and how it works with the composition. My only gripe is that the blue guys torso seems a bit off. Like its twisted too much. If you could lighten up the background color's a lil bit, it'll help bring out the blue guy more. But still, I love the pic, keep it up.
Aww kool, very nice, first off the whole idea is cute, and the contrasting colours of warm and cold look great, her socks.. awesome, line art is very neat, so is the whole piece, and the backround is just lovely, well done!.. oh yeh, the glowing bits are also very cool!