He looked happy and carefree.

他看起来轻松愉快。

《牛津词典》

He looked happy to be home.

要回家了，他看上去很高兴。

youdao

He looked happy when I told him the news.

当我告诉他这个消息时，他很高兴。

youdao

I looked around. When my eyes reached a corner of the room near the fireplace, he broke into a happy laugh and rubbed his hands together.

VOA: special.2009.07.04

He later told police he had left the Brooklyn housing project where he lived and took the subway to the East Village, where he looked for "happy" white people to avenge the mistreatment of black people.

WSJ: Man convicted in 2002 Manhattan bar hostage ordeal

He looked peaceful, happy even.

NEWYORKER: Swimming

The group at 3 under included Harris English, in a tie for the lead on the front nine until he stumbled to a 73, and Sergio Garcia, who never looked happy and sounded even worse on his way to a 72.

NPR: Leonard In 3-Way Tie For The Lead At Innisbrook