Concepts (style search) of Clayface and the Mad Hatter by character artist Carlos D'Anda.
Clayface impersonating Gordon in his cell at Arkham Asylum.
Batman vs Joker (Clayface)
Clayface transforming into his true form
Batman faces Clayface in his true form
Clayface is frozen and defeated by Batman
Clayface's character trophy
Joker (Clayface) character trophy
Clayface character trophy from an alternate angle.
Dr. Young's notes (Clayface Article)
Joker (clayface) defeated by Batman