Here is the corner of my living room. The computer is getting hit with the light from the dining room. It is about a 10 minute sketch. I use the balance ball for my computer chair. I didn't use a ruler, just drew.
This horse was drawn upside down. You copy a picture in the workbook upside down. It helps you from naming the items that you are drawing. If you just follow the shapes and not worry about the actual item you are drawing you tend to have better results. Your brain will lie to you and try to change stuff, while your eyes, they seem know better what is going on.