So my 6yo daughter also wanted to play with clay. I asked her what she wanted to make and she said a T-rex. I googled some reference pictures for her, made her an armature with wire and foil, and then gave her a ball of sculpey.
I did give her a hand with the shape of the upper and lower jaws, and showed her how to make the eyes, but the rest is her work.
The first piece of sculpey I gave her had some fimo mixed in, that's why it is darker.