Hi there, I'll be handling your Box Challenge critique.

Congratulations on completing the 250 box challenge, not only have you grown through the experience but you've shown your dedication to improving and that's something to be proud of.

While you have shown growth through the challenge there are some key things to point out that will help you in your future attempts.

Your line work has definitely improved, it's looking tidier and more confident. It's also great to see you're experimenting with different orientations and proportions while drawing your boxes, these different scenarios will help you deepen your understanding of the forms you're creating. I'll also point out that you started to draw larger as the challenge went on which is great, it helps build comfort when drawing with your shoulder and allows you to see your mistakes more clearly.

As for issues to point out the largest one I notice is you're trying to keep your lines as parallel as you can. If our boxes were physical objects they would indeed have parallel edges but when drawing them we have to account for perspective. Keeping the idea of perspective in mind we have to adjust and have our lines begin to converge to a vanishing point. As you can see in this example, the closer our vanishing point is the faster our lines will converge towards it, the inner pair tends to remain fairly similar while the outer pair can vary quite a bit depending on the vanishing point's location.

By attempting to keep your lines as parallel as possible you're basically working against this idea and if your lines are a bit off there's an increased chance that your lines end up diverging (which some of yours do) which throws everything off even more.

Remember that we always want each set of 4 lines converging towards a vanishing point as a set, not in pairs and not diverging from the vanishing point.

As for your question about how to fix a box, the answer is honestly that you shouldn't really. When planning out your lines you should be keeping the entire set in mind and how they converge to a single point. Trying to fix it often takes your focus off the set and places it on to that particular line, which can than potentially effect every other line you draw afterwards. Part of the reason we use ink as well is to teach us to work with our mistakes rather than trying to obsessively correct them.

Drawing boxes is a good way of getting some line weight practice in as well, just remember we want to apply it subtly and confidently as mentioned here.

I won't be moving you on just yet, I want to make sure you understand some of the issues I brought up first.

Please complete and submit 15 more boxes.

Remember to experiment with foreshortening, with some of your boxes have the vanishing point closer and in others have the vanishing point further.

While the box challenge can be draining I know you're capable of doing this and I look foward to seeing your work.