Hi Florencia,
This is what I am doing right now:
interior view one
interior view two (needs more detailaing of bookshelves)
detail one (hdr-rend)
detail 2 (phys. sun and sky) - more mulleans are needed
top view

tested color on windows..

but liked it better with 'normal'
Bird view
south entrance (doors need to be modelled and glass in right window)
The mulleins to the left in the small window (ground level) are the level of detail which will be in the "over all", in the 'detail 2' render I will modell them.
north entrance - prefer this to the one above.
I like the white-purple-gold colors, although the interior need definition.
Let me know if you have any suggestions
Ida