Thank you guys.
Druwee, I finished this project before your comments about the article, i have already read it, and will try not to repeat my mistakes next work, thank you. The floor is made with floor generator, the gap between the boards is about 2mm and the extrude height is 20mm, maybe its because of camera angle or i should take higher values, i'll try next time.
Maru, fresnel ior on floor is about 3.5 and the color of reflection is 30, glossines about 75, on wood ior is about 2 and metals are 50, i tried to re-create viscorbel's tutorials, maybe in corona i should use another way? Leather was just converted material from model+model, no tweaking :) the table really looks bad, didn't notice that on previews, region-render will definitely help, don't know why I didn't use it.
I will find the discussion on leather.
Thank you guys for such good words and critique, very often its really hard to see your mistakes, you look at the work and don't like it but not always understand why. Seems like I made a huge mistake, that I start posting my works so late, your comments are really helpful :)
