look oneself
v. phr. To appear self-possessed and well; look or seem in full possession of your abilities and in good health; to appear all right or normal.
Mary had had a long illness, but now she looked quite herself again.
It had been a big night, and Uncle John had been drinking freely, but he looked entirely himself after a night's sleep.
■ Often used in the negative.
What's wrong with Larry? He doesn't look himself.

[TahlilGaran] English Idioms Dictionary ▲