What I do genuinely wonder is what could be
Horus Lupercal's desktop background.
I see 4 possibilities:
-A picture of Horus Lupercal (the character) or anything related to WH40K.
-A picture of something related to the military.
-A picture of Iris or some woman that used to be hot in the 90's.
-The phone's default background or something really minimalistic that he hasn't changed in months/years.