Was the name meant to be about Down Syndrome? I guess it wasn't meant to be offensive. It's neat to see your take on some really popular characters. You've done so much work already! I think Marge is probably the most impressive. It's something with the hair.
I like the giant chins. Well, Bart doesn't seem to be huge in that facial area. Maybe you could have put in a background. This was a decent effort of yours. Dang, they look sad.