How about displaying some of your portrait photos so that viewers of this thread can make a comparison before giving you their opinion? That way, they can provide you with more useful comments and suggestions.
Nice. I think the series is more architectural than abstract. But nice!
I like the portrait shots, though personally I would have preferred the last shot (girl with bear) to be placed off-centre. There's a lot of negative space in that shot and I think it could be used to create more impact. Just my thoughts.