Help plZ(window glass problem)

[Sweet Architect]

Hello every one,

I have a very tinny problem with rendering a suitable glass material for the attached view,

 

the settings I used:

Vray material:-

Diffuse: dark black

reflect, refract: white

fresnal reflection :checked

IOR:1.52

 

 

also used vray light, the same window size ,mul=30,invisible=checked

 

Rendering menu

used environment map(so that can be seen through the window)

 

the problem is I didn't feel satisfied with the window glass material, it isn't look real at all ..

So... any suggestions?