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8:28 PM, Sunday July 26th 2020
The first thing I noticed is that you have fraying on both ends of your lines in the first exercise. The placement of the beginning of the line should be specific and on a single dot. I'm also seeing some arching in your lines, which may indicate you aren't using the shoulder pivot. In the plotted and rough perspectives you are repeating your lines. If you are trying to increase the lineweight for the boxes, the lines should only be repeated on the outside perimeter of the box, and the lines should be ghosted with the intent to overlap. Some of the lines in your rough perspective look a bit rushed.
There is a little bit of an issue with getting the accuracy of your ellipses down, but this is a common issue and will improve with practice. You've got the confidence and smoothness down which is key. The lines of your minor axis aren't splitting the funnels directly in half, although they are pretty close in most cases. I'd also recommend using a round object like a bowl to make the curving guide lines for the funnels. Here it looks like you might have freehanded them?
Next Steps:
I'd do another page of the rough perspective, being sure to focus on doing single, confident ghosted lines (no repeating). If you're going to increase the lineweight, do a single, ghosted repeated line on the outside perimeter of the boxes. In your rough perspective exercise the boxes themselves were fine (lines either parallel or perpendicular with the horizon line) but doing another page of them will help with the upcoming 250 box challenge.
Good luck!
Staedtler Pigment Liners
These are what I use when doing these exercises. They usually run somewhere in the middle of the price/quality range, and are often sold in sets of different line weights - remember that for the Drawabox lessons, we only really use the 0.5s, so try and find sets that sell only one size.
Alternatively, if at all possible, going to an art supply store and buying the pens in person is often better because they'll generally sell them individually and allow you to test them out before you buy (to weed out any duds).