You should be focusing that weight extra along the outer edges of your form and not the inner corners. You can reread this section about how to apply your extra line weight for this chalenge.

Because there were some issues that were still coming up between the revisions, I wanted to swoop in here and see if I could help address them myself. Your results have mostly improved (although there's one big mistake I'll address in a second), although there are factors involving your line quality that I would like to correct, or at least understand a little better, before we have you continue on.

The major issue I alluded to above is this box where you most definitely extended your lines in the wrong direction (towards the viewer), and also ended up with a box that contradicted the basic principles of perspective (far plane should be smaller than the closer plane).

When extending your lines, remember you're not extending towards their convergence - because if your convergence is in the wrong correction, this wouldn't help us identify the mistake. Instead, you're extending your lines away from the viewer in 3D space. Based on the fact that you did add hatching to one of the faces that were closer to the viewer, you do seem to understand which side is which.

One trick you can use to ensure you're always extending your lines in the right direction is to look at the original Y you started with. Start at the midpoint where all 3 segments of the Y connect, and then extend along one of those edges. This is always going to take you away from the viewer, and further back in space.

Now, what I'm going to ask for may be a little inconvenient to deliver, but it's something that would be very helpful in allowing us to identify specifically how you could change your markmaking approach. Is it possible for you to record yourself drawing a box?

We don't need to see your face, but being able to see your arms, see how you pace yourself, where you invest your time, etc. will help us identify any misunderstandings that may be getting in the way. Obviously this won't be something you can do while holding a phone with one hand - you'll either need to be able to set up your phone to record from a static position, or have someone else holding the phone while you draw.

I understand this is by no means easy, but it would be really helpful.

Also, as a side note - I actually updated the ghosted lines content recently (where I explain how the ghosting method works), including live recordings of me working through the material, instead of the digital demonstrations that were available before. This may also help you better understand how the technique should be applied to get the most of it. You'll find it here.