Drawing a room.

     I've was bored and didn't knew what to draw. So i decided to draw the room i was in. But i failed in some points.
     My first mistake was drawing it in a changing enviroment. Some people came and changed the place of the table. My friend, who plays with his computer, changed his positions all the time and moved his computer after changing every position.
     Second mistake is not knowing the rules of perspective. I should've made a plan first than add details. And paper being short the drawing got completly deformed.
     Third mistake is that in some places shadows are just too strong and not layered. They all look the same.