so, I’m a nooblet, more easy, imposible :p, and I don’t know how to illuminate a scene, I’m trying but for some reason does not look as I want; some times is darker or to much light.
My last work is this library scene and I wanna know if is good enlightened or not. Well I can finish this as a final result, but better hear a second opinion. What you think? throw your critics.
PD: yes! english is not my natal tongue 
night version:
day light version
