The reflection could look better period. Doesn't matter if you use vectors or not. Vectors are a means to an end not the end by all means.

Any ways the window looks a bit... flat. It looks like a standard PS work and boy do you want to stay away from that (at least I do). Add some hints of relections, of other light sources. Don't use Bevel/Emboss unless you're sure you want to, there are better way of achieving shaded effects (like a paintbrush). This isn't meant to sound destructive but rather constructive. Just a PS veteran trying to help out.