What am I supposed to respond with to a wordless snapchat picture?

[AlexanderAnttila]

I have this one girl on snapchat and we do have regular exchanges there, but once in a while she'll just unprompted send a picture of herself without any text of her in bed or just close up of her face smiling. I don't respond to those since I don't know what to respond with.
What is that supposed to mean?

[iseekpinetrees]

Be strange. Tell her whatever comes to mind, shit I do. I point out their eye color beard shirt weird crap in the background that might be cool lol be random af.

[imanf7]

Tell her she's pretty and send one back

[SuccessfulHornDog]

Respond with hey, what's up?

[Syrian_survivor]

With another wordless snap picture lolz

[Anonymous]

Send a picture back.