After going back through your thread again... it seems you need to go through the short pain of doing highly accurate observation drawing. This means drawing from life/measuring.
If you can't get a model pose in your town, try setting up a still life and drawing it as exactly as you can... by measuring.
This may not give you exciting drawings; but it does kind of sensitize you to the level of accuracy your eye must see and be aware of.
I think once you're over that hump, and can reproduce things pretty accurately, you'll be ready to apply the rules of construction to your imagination work.
There is a lot of work to do, of course. But you have a great start. Never forget the reasons why you want to draw... always let the thoughts of those things motivate you. And when you feel like stepping away from your drawing board, it's in that exact moment that you must stay. You must stay and work through that problem... work through it a few times. And when you've worked it out, it will feel good and right.
Here's a link to a Ron Lemen video on measuring: