Your CSI lines look great! Nice job with the simplification. The overall proportion of the boots is a bit squished height-wise. It's a lot to juggle mentally when you're focusing on simplifying the forms, but one thing you could do to help set up the image in proportion is to draw a simple shape that outlines the whole form (both boots). Try to keep the image within the bounds of the shape that you create. Hope that helps :)

Great idea using the perspective boxes! I can really feel the weight in your drawings. Remember to keep your lines long and loose until you're ready to commit to a specific line. Keep up the good work!