When a girl consistently sends you selfies without any accompanying message, it could mean a variety of things depending on the context and your relationship with her. It's possible that she's seeking a reaction from you, whether it's a compliment, a comment, or simply a confirmation that you've seen her photo. This doesn't necessarily mean she's seeking validation, but rather she enjoys the interaction and connection that comes with sharing her images. Another possibility is that she's trying to keep up a streak with you, and sending a selfie is a way to initiate contact and maintain the connection.
It's also worth considering that a girl might send you selfies as a way to express her feelings without having to say them out loud. For example, if she's feeling shy or embarrassed about something, she might use a snap to communicate that indirectly. On the other hand, if she's constantly sending you sexy or suggestive selfies, it could be a sign that she's interested in you and wants to flirt.
Overall, how you respond to a girl's picture says a lot about you. It's important to be respectful, honest, and interested in her, and to avoid coming across as creepy or pushy. Whether you choose to start a conversation or simply send a compliment or a cute emoji, make sure your response is appropriate for the situation and shows that you value her as a person.