look oneself|look Идиома
look oneself|look
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.look oneself|look
v. phr. To arise assertive and well; attending or assume in abounding control of your abilities and in acceptable health; to arise all appropriate or normal.
Mary had had a continued illness, but now she looked absolutely herself again. It had been a big night, and Uncle John had been bubbler freely, but he looked absolutely himself afterwards a night's sleep. 
Often acclimated in the negative.
What's amiss with Larry? He doesn't attending himself. Dictionary