@bahri said:

more editing... how about this ?
use kerkythea preset #19..35 phases it took about 3hr and 55 minute

Hmmm... Well I think maybe a couple of things can still be improved.

I can think of :
1- adding a jpg in the Self luminance tab / Radiance of your white board material : this will create a self lluminant material like a tv screen you'd watch in the dark...
2- try to insert a global sky or some global HDRI. THis will bring some natural reflections to your scene ;
3- maybe some more work on the materials like the columns (they look a bit flat to me... I dunno...) ;
4- maybe place a plant or flower in the foreground and try to move your camera again to catch the plant and the room.

OK well, I hope you'll find this more useful than annoying... And again, experiment with Kerkythea, browse their forum and even maybe post your Work in Progress on KT's forum. Lots of amazingly nice people out there too !

Waiting to see more !
Nicolas