9:27 AM, Friday January 29th 2021
Hi, this reply is quite late (haven't had the time to draw recently) but thanks for the critique!
I tried redrawing some boxes per your advice here: https://imgur.com/a/lOtXbsB
I wasn't able to get it down exactly right since my line accuracy has deteriorated from not drawing for a month, but I think I get the relationships betwen the inner lines more now after having practised with your references. I hope I've improved, even if just a little bit.
Please let me know if there are any glaring issues with my revisions or if I still lack understanding in my drawings. Thanks, and sorry again for the (extremely) late reply!