Assuming you’re not a soulless monster, you love historical photos. You’re in luck because the Library of Congress digitized thousands and put them online to view.
This one is of Pancho Villa sometime during the Mexican Revolution (1910-1920). He is in a formal military uniform with his right arm resting on the barrel of a mountain howitzer.
Villa was commander of revolutionary forces in northern Mexico and infamous for his raid on Columbus, New Mexico on March 9, 1916. Nearly ten thousand regular army troops spent the next two years chasing him unsuccessfully through northern Mexico while thousands of National Guard troops guarded the border.
You can view and download the photo from the LoC.