I believe the main focus of the exercise was doing exactly that. Also using CSI lines and doing them in one motion. From what I see in your line quality for the boots, you seem to join a lot of very small strokes together which is exactly what the exercise is meant to teach you to avoid. Don't try to copy every detail exactly how you see it. Nobody will be able to tell if the laces of the shoes were a few millimeters further to the left or the right. People will be able to tell if you used clean confident strokes or insecure short strokes. In my experience these short strokes are the result of two things 1. Insecurity where the line should go so we do a lot of short strokes and correct the direction with every stroke 2. Being afraid of making mistakes. If drawabox was good for one thing for me, then it was helping me with getting rid of those habits to a degree. Essentially the exercises there, while often tedious, teach you to not value every practice drawing you make as if it was something you wanted to put on display. They essentially make you draw things so often (e.g. 250 boxes in perspective) that at some point you stop caring about how one individual box turns out. Ironically your lines look better once you stop caring that much, because you stop overthinking it and don't worry about every little stroke anymore. Later lessons in this course will also focus on how to measure and construct things, going from big shapes to smaller ones. That may help with the "avoid errors" mentality as well because you will learn how to build a lightly drawn rough orientation construct for where to place your lines before you actually put down your final darker lines. It removes some of the uncertainty. In the end my recommendation would be to just draw a lot while trying to focus on doing confident long CSI lines. If you sit down and do a lot of animal drawings or a few every day, eventually you will stop worrying about placing every line perfectly and use longer strokes without thinking about it (maybe even to just save time, given that this approach is a lot faster than doing all these small strokes) hope there is something in there that helps you a little.