Thanks Marked001 and Frederick.
Frederick,
In reality, the tiles are really as reflective as in the rendering.
On the site images, however, the tiling caught some dust because of the work going on there so the reflection is less visible there.
I discussed the risks of that type of tiles being slippery with the client in design phase, and he decided it was best choice to use.
Indeed caustics (=light patterns on objects caused by refraction of light in the water)would enhance the realism, but in my experience (other render engines),using caustics shoots render time through the roof. (Podium doesn't support caustics in current version).








. I am pretty sure that a lot of people are capable of producing good output with different render engines. I believe it's a matter of a little persistence and being prepared to invest (sometimes a lot 

