What I know of the photo is that it is taken in a mostly bombed out city. It was taken from a rooftop and the focus of the picture is a Soviet soldier holding out a large Soviet flag as a symbol of victory. I have seen various versions of the photo ranging from black and white to full color, but the one I saw most commonly had only the Soviet flag colorized. I know a small piece of trivia about the photo as well; the soldier holding the flag is wearing two wristwatches and that portion was often doctored out so as to not show the looting and pillaging that followed the battle.
This is the highest quality version of the photo that you seek that I could find, 3,543 x 2,557 pixels