Very cute - I would darken the outlines of the mice a little, however, and add shadow beneath them, thus grounding them on the floor. The texture on the wall and the floor is neatly done, although the colours are quite dark, making them a little overwelming. Sometimes if you lightly rub an eraser across the colour you can mute it somewhat without damaging the paper. Believe me- it's a technique I use when I accidentally make the sky too dark (which happens more than I would like...). These two would probably work quite well in a vertical format too, because they're quite tall, but not so wide, which would eliminate the large amounts of blue.

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