3D with hand-drawn character

I have had this idea for a while of using the 3D pet shop I made as the background and Flash for my characters. Below is an image I made combining the 3D background and a drawing I did of my Remus character.


I think the only thing that is wrong is the background is too solid and doesn't fit in with the cartoony style of the characters. If I put cartoony texture effects with black line edges it might look better. I know you can do it but Im not totally sure how so I will have to see a lectuer about it.