Looks good. I think you're ready to move on to the 250 box challenge. You might be able to make a heavy ink fountain pen work in lieu of a fineliner. I was able to order some fineliners on Amazon as the quarantine has closed most shops.

I noticed some of the lines in the organic perspective homework look a little curved, which I've found happen to me when I accidentally use my wrist too much for them. Really focusing on ghosting a few lines intentionally at the start of an exercise can help you notice when this is happening.