Too much praise will turn her head.

She prides herself on her beauty.

She flatters herself by thinking that she is beautiful.

She flatters herself that she is the best speaker of English.

He has too much pride in his appearance.

He flattered himself that he was the best actor.

He has an enormous conceit.

He flatters himself that he is the best speaker of English.

He flatters himself that he is something of a poet.

He is a little above himself.

Everyone is more or less conceited.

The popularity turned her head.

He fancies himself somebody.

Kenji flatters himself that he is quite handsome.

Conceited people take it for granted that they are superior to others.

That girl is arrogant because of her beauty.

As is quite common for teenagers aged from 13 to 19, she's conceited.

Mr Koizumi is really full of himself.

Don't flatter yourself.