First, a good impression
If this girl is shy and has a crush on you, she will send out some weak signals to test whether you are interested in her. For example, it is possible to do a little gesture of empathy, or pull you to ask some questions, or share some interesting things. So she sent you an expression pack: compare with your heart, otherwise you may have a good impression on you.
Second, thanks and appreciation.
When a girl confides in you, it is more likely to express her gratitude and appreciation. Maybe it's because you helped her finish something or did something yourself, something she found a little difficult. She thinks you are great and can't help but give you a comparison and praise, so she will send you a comparison picture or a praise picture. But in fact, most girls tend to compare pictures, because the pictures they like are really a bit official and a bit old-fashioned.
Third, girls are in a good mood.
Girls are emotional creatures. When she is in a good mood, everything is fine, everything is beautiful. When he is in a bad mood, whoever gets close to him will die. Therefore, when she is in a good mood, she may use expression packs to spoil and sell cute, and it is a very common expression pack.
Fourth, exude personal charm.
Girls nowadays are better at creating personal designs. Although they don't need boys, it doesn't mean that they are unwilling to attract boys and show their personal charm. Not only boys will be Neptune, but also girls are willing to be Neptune. She will think it is a symbol of self-charm. But who can refuse attractive women? It's not me anyway. Yes, I like it.