first one is nice, but the glass in the daylight shots is definitely too smooth, flat and a bit 'CG' looking. in the second one maybe put some clouds reflecting in the glass. also, maybe you can apply some kind of slight bumps on the glass surfaces. one trick is to select 2 or 3 random groups of glass structure elements and apply different very soft bump maps.
have a look here for a strong bump effect in a real photography. not all glass facades of this kind are that 'bumped', of course.
http://daguerre.frejol.org/photos/20040 ... 8x1536.jpg
good work!
cheers
markus
btw. your www link is not correct.