Dashed lines: either lines that I drew that ended up missing the point. I felt that I should do this to check how far off my initial estimated point was (these are usually back corner lines). Also sometimes used for... really curved lines.

Outer repeated lines: I attempted to add the subtle line weight for each box, but my super imposed lines ain't the greatest.

Biggest struggle is I have a hard time imagining where the lines will go before I actually draw it. Then after I see it and go "oh" I'll either overcorrect or undercorrect the angles while plotting out a bunch of different points. I'm a slow learner so I'll get there when I get there I guess. ¯_(?)_/¯

But yeah, some things did start clicking, such as..

1. The further distance (perpendicular) the corner of the box I was going to draw my new line was from the initial Y line (extended with ghosting) then the steeper the angle would be.

2. When looking at the back plane my eyeballs have a larger degree of moving from end to end (idk how to explain this one properly sorry)

3. Extending Y line (by ghosting) the other direction to find which "zone" the back corner point will lie in (I also dunno how to explain this well in words)

4. Use parallel lines to define the outer boundaries of the box (helps eliminate divergence of lines)

But yeah, finding a feel for how deep/shallow angle the lines should be is difficult..

Anyway sorry for the long wall of text hahahah. Feedback welcome.