just look at the povray hall of fame to see what can be done
http://hof.povray.org/
su2pov creates a povray file which can then be easily edited without going back to SU.
for example the material qualities are all declared/described in the file (and can be changed but not usually necessary)
mwsnap012.jpg
then the matrial quality assigned to each material can also be edited:
mwsnap013.jpg
so if you wanted your glass to be more reflective, just change the setting from shiny to mirror for example.