How to write like writing a simile to write that there are many people in the square?

As follows:

1, The square was very crowded, densely packed like ants.

2. The square was so crowded that not even a pin could be stuck in it.

3. The square was so crowded that it was like a speck of starlight in the starry sky.

4. In the fall, people in the square sang and danced like a group of hard-working ants celebrating the harvest.

5. In the fall, the square was bustling with people, like a group of hard-working ants stocking up on food for the winter.

6. The square was so crowded that it looked like ants from upstairs.

7. In the fall, the leaves on the square fell to the ground like a flock of butterflies flying down.