Alone on a crowded city street...excellent.

The lady 'sightseeing' and the man smiling, are lucky expressions to catch behind this person. I wish there were a bit more pavement in front of the sitting individual.

This is my typical thought of loneliness. Good composition with the business man in the background and the lady looking in the other direction. My only problem is that it is not pin sharp, and I think it would look good if it was slightly desaturated and the colour temperature pushed down a bit.

Technically not the strongest image, but I know how challenging street photography is. I like the oblivious woman looking at the sky in the back left and the man on the right who almost looks as if he is laughing at the begger.

I may be wrong, but the shoes on this guy clearly suggest he is not down and out - he is either the photographer or his confederate I would guess. It sort of detracts from the impact of the shot.