It would be neat if TTG added little, subtle differences around the game dependent upon your actions. I have two polar opposite Lee's and the drawings seemed the same to me. I just think the chalk drawings are there to imply that the kids are really bored and playing, just to add atmosphere.
To be fair, I've treated Clemmy nicely in both of them, but in one she's seen me kill almost everything that moved. Maybe it's because I haven't made her cry, yet, or something. TTG? More atmosphere?