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 Joker

Clayface transforming into his true form

Clayface attacks Batman

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