Poseur

The books of this literary poseur were widely read but they are now forgotten.

He pretends he's an artist, but he's just a poseur.

She only dresses like that because she thinks she is getting the boys' attention; she's such a poseur.

But he was also, what seems almost incompatible with this ferocious truthfulness, excessively self-conscious and morally attitudinising, a thin-skinned poseur.

I am a poseur and I don't care / I like to make people stare