I wouldn't mind a minor improvement in the model look or movement. As a whole i think that with the addition of textures that the look of the game is more than fine. I do find as a newer player that commonly I find myself wishing for the ability to rotate my arm or leg at the shoulder or hip. To combat any additional computing power for a higher poly count people with less capable computers could easily turn off the blood. I have noticed that the blood significantly hurts frame rates when turned up. When it is all said and done though, it doesn't require these improvements to be good or keep me interested.
My largest area of concern is cost of customization. I get that this game is free, and that they have to make their money somewhere. But the cost of being able to make your Tori unique to you is obscene. I don't feel like its unreasonable to say that if I were to pay $60 (as much as a new xBox or PS3 game), I should be able to customize my Tori any way I could imagine. But $60 would only let you dabble with some gradients, maybe some textures, new blood.... that is my only real issue with this game as is.