The word "lose green" in the poem is used well. Please tell me what is good about it.

Green is a noun describing color, but in poetry it is used as a verb, meaning to paint it green. In this way, nature and spring are personified, making the poetry vivid and emotional. It closely corresponds to the word "photo" that follows, and at the same time satisfies the rhythm of the poem and the image description of the scenery, which is indeed rare.