Room Interior low poly

My first Blender proyect I followed a Youtube tutorial from 3DGreenhorn: https://www.youtube.com/watch?v=AKVO90hKR64
I really wanted to create a low poly 3D room with ortographic view so I decided to start with that. I have changed the colours to give it a modern touch, but it has turned out to be a room where patients wait before entering the dentist.