PIXPAST is great! Thank you everyone for sharing.
My site is at http://marksrussianmilitaryhistory.info
It's set up as one big page with links, so ignore all the text articles in the first hundred or so links - they're for historical research that's mostly pre-20th century. Go down to the bottom to "Uniforms" for links to photos. I try to collect photos of full dress uniforms of the world 1910-1914. I think I have a good run of US photos focusing on the M1902 dress blue uniform, and a smaller group on wives, girlfriends, and sisters wearing someone else's uniform. And if it's an M1902 uniform - hey, two for the price of one!
I stopped collecting Russian tsarist army photos because the research and posting is done so well on Russian language sites such as Sammler.
I would be especially interesting in anyone's opinion on the one I call "Guantanamo police" at http://marksrussianmilitaryhistory.info/USPhotos/Guantanamo/Guantanamo.html