An example of a sentence describing a character's expression is as follows: Her eyes were filled with sadness and worry as if the whole world had disappeared from her eyes. His expression was cold as if he didn't care about anything. The corners of her mouth curled up slightly as if she had her own thoughts on this topic. His eyes were deep and solemn as if he was looking for something. There was a trace of helplessness and disappointment on her face, as if the whole world had left her.