Both of these pieces are great! :-D I'm impressed by how many RoS characters you were able to work into this delightful Christmas tableau. While I love the bright colours of the first piece of artwork, I think the sepia tone works even better because everything blends together so nicely.

I'm trying to think of some suggestions for you. You already covered this a bit with your first Christmas project designs, but artwork with a winter wonderland type background would be delightful. The only other thing I can think of is some artwork that references other Christmas works (e.g. A Christmas Carol). However, that could prove to be difficult and time-consuming.