I can imagine how someone could guess the tags (like, probably it was between the pixiv tags) but can you really tell who is who?, I guessed Japan (because of his clothes mostly, and hair) italy and germany (behaviour)Romano (ahoge, and looks like his bro)and América (behaviour) but I couldnt tell UK o.o, I searched this image just to see the tags and find who he was xDD

And the one who's takeing the picture is me xD

I'm not sure if the picture is RussiaxJapan or AmericaxJapan. I see a person resembling America (he has that cowlick) running with Japan's dog. And judging by the hair style I'm almost sure the one with Japan is Russia.

Wow, I think these are the steps in Kinkakuji or something