Checked it w/ stegdetect, didn't find anything ("negative" CLE output).

Also checked using fotoforensics, saw nothing unusual.

Mostly shows wallpaper sites w/ Google Image search. One result was FB page: (Spanish?)

https://www.facebook.com/Fotos-De-Calaberas-Militares-109857527047353/

Title: Fotos De Calaberas Militares = photos of military skulls

About section: Armas y calaveras = weapons and skulls

Not sure if it means anything or just random. Handing off to others for further investigation.