Thanks for support and encouragement! I'm grateful for for criticism. How could I otherwise improve?
Mark, over time I have to become more and more bothered by the perspective thingy. But this comes from my method, I use the SLR as a TLR which leads to a lower point of view. Otherwise people would be too bothered by the camera. And the framing is no easy thing to fix. The metro is full of people, commercials etc. I always concentrated on people's expressions and let the other things just be. I somehow like the faces cut in half etc. The empty areas, well I'll have to think about that.
A friend of mine who also is a very good photographer helped me to choose about 45 pictures from this series that I will go through and try to do nice prints during the holidays. Then I'll show them to a gallery. Let's see how it goes!