Love SG. It's one of my favorite ways to pass time. I have some suggestions that I think would be cool:
Nail Paint - the ability to customize the color of her fingernails and toenails. The zoom in options you added to the studio are awesome. You could add nail color and add a zoom in on feet for feet pics.
Toilet - just like the shower you can add an animation for her to pee to relieve stress, but less stress relief then the shower