Thank you for your replies, much appreciated!
I did not suspect the thread would come up again - and the silence of course made me think about the weaknesses. In short, I left the tilted window because I felt it contributes to the overall look. I think I will correct it, it certainly won't hurt. I agree also with the critique of missing context, just these isolated views, nothing more, I have to agree, thats a bit unsatisfying. At shooting time I wasnt thinking about this at all, I had planned to just take details this day to see what would come out.
By the way, I did the blue cast to indicate that something is "wrong", disturbed, like a general feeling. But Im sure it can be interpreted in many different ways.
Special thanks to popnfresh for the mention of Robert Polidori and Chris Jordan, they have very interesting and inspiring work. (Conceptual-wise I like especially Chris Jordan's work.)
Christian