Now this may provide an excuse, but I'll mention it anyways

The round balconies (the two in the same vertical line) look a bit.. awkward to me.
Same with the rectangular balcony on the other side, but I'll leave that one up to you =P
Looks like it would benefit from a roof.
Now somebody mentioned to me that bruce might possibly have some conical roof moulds now =P
You could make the above lying balcony in a full rectangle and use three-quarters of conical roof to give the round balcony below a roof.

As hinted earlier, since some balconies are roofed, I'd sort of expect it to have all balconies roofed... but meh, upto you offcourse.
And no idea how to fix or improve on it, but the bottom part of the project, on the outside at least, looks a bit... dull.. perhaps more accuratly, box-y, just figured I'd mention it.. perhaps somebody else has a stroke of genius regarding that.