This painting is "Laozi Riding on a Cow" by Zhang Dabei.

It depicts Laozi riding on a cow, followed by two children.

In the picture, Laozi sits on the back of the cow with a calm expression, as if he is thinking about something.

His hair and beard are long, giving him a mysterious feeling.

The two children stand behind him, their expressions vary, some look at Laozi curiously, while others seem to be a bit scared.

The whole picture gives people a sense of tranquility and peace, as if Laozi's thoughts are being passed down to people.