Sometime underexposure can be unavoidable like that. Could probably use a levels-gradient to lighten the bottom right corner of the image a bit. Very well composed though, you've caught the bustle of the street well.
I like how the two figures in the foreground out of focus gives this shot depth. It shows how he is indeed hiding in his little corridor. You picked up some noise by "saving" his face, but it gives the gritty feel of photojournalism.