Looking at the sky, the weather is getting dark. What's wrong with it?

This sentence is not properly matched. It's not dark, it's cold, or it's getting dark. The subject is me, which can be omitted. In addition, the weather and the sky are in the sky, which is common sense and there is no need to use the sky. If the sky is definitely looking, it is unnecessary to look. So it can be modified as "the weather is getting colder" or "the sky is getting darker".