Nawwwr, well ain't that cute. Really like what you've done with this and I think that these two pictured like this would certainly make anyone's who saw it just sort of melt. I really like you design and the expressions involved with both of them. Especially Pikachu's, oh gosh, his widdle hair tufts and his smile that's all 'soooooo sooooooooft' is just priceless.
This picture is good enough without a background, but giving it one like a bright and bubbly background or something warm would just complete it in the cute department. Once again, very excellent work and Merry Christmas!