Well, may be (and i hope so) I am wrong, but I suppose that the shape of the nose is not really correct!!!
http://www.airliners.net/open.file/1028418/L/ look at this foto for example and many others that that could be found in airliners.net... the other thing that can be seen on this foto is the shape of the last (right) cabin window - it is actually smaller than in visual model of CS 757...
I really like CS 757 visual model, I think that it is the best for the moment, the only think I want is make it ideal... :)