So the glass is too mirrored. Turn down mirror factor in Reflection Class.
As for lighting, i see that you are using the undersun method. What Archicad version? If using 10 or 11, the internal sun will make a faster rendering that the sun object.
Turn up your ambient and skyobject intensity to mitigate shadows.
There's this book that covers most of these aspects…
Dwight Atkinson
