"Show don't telll" - English

What do you think “show don’t tell” means?

Show, don't tell is a technique used in various kinds of texts to allow the reader to experience the story through action, words, thoughts, senses, and feelings rather than through the author's exposition, summarization, and description.

How can we re-write these sentences to “show” and not “tell”?

Here is my explained about re writting " show and not tell" sentences.

The buildings were tall.

- The building was high rise up the sky.

Sarah was really upset.

- Sarah knock down on her knees as she had tears falling down her poor face.

She was so happy to see him.

- She had a huge smile on her face as he walked near her.

The lake was beautiful.

- The lake was so shinny as the sun was above it.