The future looks very bright/rosy.

未来是光明的。

She brightened up when she heard the news.

她听到那个消息就开心了起来。

His face lit up when he saw them.

他看到他们，面露喜色。

They had shining eyes and beaming/dazzling smiles.

他们眼眸明亮，笑容洋溢。

The bride looked radiant.

新娘子看起来光彩照人。

You have to look for the light at the end of the tunnel.

你要在前进途中寻找隧道尽头的曙光。