If someone sends you a snow scene 520, it means that he likes you. Because: I enjoy flowers in spring and snow in winter. I miss you when I wake up and miss you when I dream. It means he is thinking of you.
If you like a girl, you must send her photos of snow scenes, because: enjoy flowers in spring and snow in winter, I miss you when I wake up and miss you in my dreams. It means he is thinking about you. If you like a boy, send him a photo of the sunset, because: when I look at the sky at dawn and the clouds at dusk, I miss you when I walk and when I sit down.
If a boy sends a snow scene photo to a girl, it means that he is thinking of you and wants to receive your photo, but he is too embarrassed to ask for it directly. He wants to get your photo through courtesy and reciprocity to relieve the pain of lovesickness.