how can we describe the life cycle of a butterfly by using metaphors and similes?

Answer 1

You could compare the colors of the butterfly in different stages of life to things in nature. Such as a butterfly with wings the color of marigolds.

Answer 2

Simple comparison is not the same thing as metaphor or simile.

Read these definitions and examples:
Metaphor — https://literary-devices.com/content/metaphor/

Simile — https://literary-devices.com/content/simile/

Let me know some of your ideas, and I'll help you.