Collage

This is a project I need to do for school. The brief is to create a character design with collage. I've decided to use exclusively colored paper instead of magazines or other materials scraps materials just because this is the kind of collage I like.
Look at these artists websites... they're really amazing and I took inspiration from their use of the paper to create my first collage piece. I really love the tridimensional effect they are able to create...

Bomboland
Kate Slater

So yesterday it took me a whole day but this is what I've come out with

Now I need to draw a background for my character... any ideas??

(The photo looks a little bit red but actually it shouldn't... sorry!)