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Hi Reza,
Here some suggestions:
* Don't use Max's skies. They look crap when used for most renderings.
Architects usually want to see their buildings portrayed in bright sunlight
on a clear day. Only a few puffs of clouds.
* Because you want to simulate a clear sky day, you need to increase
your contrast a lot more. Set you direct light to 3-4 mulitplier. Keep your
environment at 1 and set the HSV to .0 and 1.
* Give your direct light a little yellow. Environ needs blue because objects
in shaodw should have a tinge of blue in it.
* Green glass is hard to reproduce correctly. Go and photograph a building
with green glass and look at it's colour. Most of the time it's reflecting
blue from the sky, so your glass colour is a mixture of blue and green.
* I agree with the comment about tiling. It's very obvious on the curved
secetion of your podium.
A technique I use to setup my lighting is to make a copy of your scene and turn it completely to white. When you render this scene, the point is to refine the level of shadow vs light. It's a lot easier to see it on a white model than one that's been textured. When your lighting is looking nice and contrasty, just bring in your model with materials and delete your white model. White models are obviously very quick to test render.
For a building like yours, I would typically spend no more than half a day setting up and testing the lighting the scene for daylight.
Hope that helps.
SunnyC
www.ivolvestudios.com
Here some suggestions:
* Don't use Max's skies. They look crap when used for most renderings.
Architects usually want to see their buildings portrayed in bright sunlight
on a clear day. Only a few puffs of clouds.
* Because you want to simulate a clear sky day, you need to increase
your contrast a lot more. Set you direct light to 3-4 mulitplier. Keep your
environment at 1 and set the HSV to .0 and 1.
* Give your direct light a little yellow. Environ needs blue because objects
in shaodw should have a tinge of blue in it.
* Green glass is hard to reproduce correctly. Go and photograph a building
with green glass and look at it's colour. Most of the time it's reflecting
blue from the sky, so your glass colour is a mixture of blue and green.
* I agree with the comment about tiling. It's very obvious on the curved
secetion of your podium.
A technique I use to setup my lighting is to make a copy of your scene and turn it completely to white. When you render this scene, the point is to refine the level of shadow vs light. It's a lot easier to see it on a white model than one that's been textured. When your lighting is looking nice and contrasty, just bring in your model with materials and delete your white model. White models are obviously very quick to test render.
For a building like yours, I would typically spend no more than half a day setting up and testing the lighting the scene for daylight.
Hope that helps.
SunnyC
www.ivolvestudios.com
Verticalidad hermano!! 
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