@drawerduck

Scoring it wouldn't help you much. The more useful question is: did I learn something, and can I spot mistakes to improve on? You already flagged perspective, which is a good instinct (it'll sharpen with practice). What I do is complete the exercise, reflect on it, rewatch the explanation, work on what I missed, then retry later. A few specific things I noticed: convergence is off on some of your boxes. The far end of the big cylinder looks off compared to the front opening, so it's worth drilling cylinder ellipses and the exercise where you build a cylinder inside a box. And the back wheels are drawn the same size as the front ones; even allowing for foreshortening, they should read a bit smaller. Most of these trace back to one thing: your lines not agreeing on shared vanishing points. Nail that and the boxes, the cylinder, and the wheel sizes all start to fall into place. Learning art is mostly learning to observe, and looking hard at your own work to catch mistakes is the key skill to develop.