Modelling - Create a kid room

I normally don't follow each step of a tutorial. I follow the technique of a tutorial by using another design. This time I have decided to make the same exact room in the tutorial, because I never used Vray before and I rarely make high poly models.

This is the result:

I must have missed a step of the tutorial, as my scene has a lot of noise and is much darker than the example. Although I can't figured out, because my light setting seem to be the same.


This is what I was supposed to get:


The tutorial link:
http://www.2d3dtutorials.com/3d-studio-max/how-to-create-a-kids-room-with-3ds-max/