I'm going to give you my honest opinion because you asked, but don't assume that my critique of this one photo applies to the rest your work, I'm just trying to give the best critique that I can.
To start, the point of view is a really too far away, thus the light post is in the wrong spot, dividing the image in an unbalanced way.  The the path that the man and women follow don't intersect in a meaningful way.  The subjects are also too far away.  
The exposure is nice, and would be better if you cropped out the darker areas of the building and most of the street.  Your verticals are nice, but your diagonals don't work for me, you should play with cropping to see if you find something that works better. 
As of right now this photo isn't strong enough to stand alone, and I feel that it would probably be a weak link in a series as well.  I really think that you are on the right track, but I get the sense that you are standing outside of your subjects field of vision because you are afraid of what they might think or say (I fear confrontation as well, so don't feel bad). 
I would really like to know what you were hoping to achieve with this picture, then I could be more helpful.  I'd like to see more of something like this, but it would need to be a bit more aggressive and a bit closer.  The time of day was perfect, and I think that you are on the right track, but you really should have exploited the shadows of the subjects more if you were worried about taking a photo of them in their line of site.
If you want any more feed back or have questions PM me.