Dingus

Your box isn't perfect, so you won't be able to align your inner lines with both each other and their vanishing points, assuming you're drawing them in last. You need to eyeball the point where two inner lines will meet before you draw either line, the same way you do for the outer ones. They won't point perfectly towards their vanishing points, but you won't get a triangle.

Personally, the order I've been drawing my boxes in is: Front corner, two outer planes, the inner plane attached to them, final outer plane, final inner line. I've found this to make my inner lines much more accurate instead of leaving them all for the end.

Agreed, I've had that little notifications dot on my name for months, and only just saw the "Mark as Read" button today. Between the name of the responder being orange, and the whole notification turning orange when moused-over, it really blends in.

Thank you for your input. Ellipses are definitely something I need to practice more often. I spent most of my time practicing straight lines since they were more relevant to the homework I was doing, but I know I can't neglect them forever. I'll also make a more conscious effort to not redraw any lines in the 250 Box Challenge, even if they end up completely off.

For my lines curving at the beginning and end, I guess I was wondering if there were any common mistakes with posture, grip, etc. that contribute to that. Would uploading a video of my process help?