I could not find the source, but according to this reddit comment, they are:
Members of Irish bands The Murder Capital and Fontaines D.C. in Hydra, Greece
AccidentalRenaissance is for photos that look like Renaissance paintings. This means that they look like Renaissance art in their composition, their coloring, their saturation, the angle of the scene, the types of settings, etc.
I could not find the source, but according to this reddit comment, they are:
Members of Irish bands The Murder Capital and Fontaines D.C. in Hydra, Greece