Design looks nice...

Glass is not clear ... Where is the problem....
As well as the non-appearance of wall color (white)

The glass transparency depends on the model you use. Transparency could be either by a semi-transparent texture (which can be changed), or a model with transparent surface. You could try other models like some found in the Libraries of 3D models, especially the new models in 3DModels-Contributions-1.6.1.zip. - you can also find the individual window models in the Free 3D models:window - but remember to import them as Door/window.

If the transparency is not a texture, but a transparent surface in the model, it is possible to export the window to .obj and edit the transparency in the .mtl file - not entirely straightforward, but some threads (like 5056) might help you if you want to try.

As for white colour, I am not sure what you mean. But white will never render as 100% white, as that would not create a life-like rendering.

ok