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Hi! How can i improve the clearness of details in a render? Which parameters?

You will have to be more elaborate than that. Show your render first, then we can see what we can do to help you.

In green zones, i want to see better the lines.

Alek6 wrote:In green zones, i want to see better the lines.

Make color of texture lines darker.

Ok, i thought that i could do it with a different light... i'll try this solution

You need a bit complex texturing (good diffuse map minimum 2000 pix seam , reflection map, and bump map created by NODE Normal net...in attachment)
Do not forget for exteriors white color maximum 80% diffuse....
One more think .... camera: ONLY SHIFT CAMERA for exteriors.....

Ok, i'll try that, thanks for advices

It's better but not much

If you have links for helping to create materials, can you put them here, please?

I try make fast PS for that. Contrast is very bad (You have bad tonemaping and setup of surfaces) Remember exteriors are difficult and render buildings without environment always bring bad contrast . Trees, trees and trees this You need to hold photons....
btw I hate clip maps....