My child sim was very sad from the death of his father and I had him draw an animal picture at the drawing table. He drew a very rough outline instead of the detailed pictures he'd drawn before and I thought that was strange. A few days later, when he was happy, I had him again drawing an animal picture and he drew the same picture but much much more detailed. I thought it was nice to show the emotions effecting him like that and a good expression of how sadness can make you lacklustre and not put as much effort into things. A nice little touch.
I can't post pics yet but I'll put the link here without the http and you can put it back in for yourself to take a look if you want :)
://i44.photobucket.com/albums/f45/gemjamgem/sims_zpsk9nkhx1a.png