The lesson says that these two points should be placed far enough one from another. The question is - how far? How one measures the correct distance between the two? And thought I fully understood the idea I kept fighting with the correct direction of these lines.
This is the result that I'm really not happy about.
And these are supposed to be a bedroom drawn in wrong angles.
I gave up on those pretty quickly since I understood that to order succeed in this one I have to practice way beyond this post, so I'll just keep moving on.
P.S. This is definitely the best drawing program I've done so far.