Hi!

Arrows: Lines are confident and you've made good use of perspective. Try to pay attention to which side you apply shade to, sometimes this is on the wrong side. This can happen, no worries.

Dissections and texture analyst: Well done, keep up the good work! You understand what cast shadows are.

Form intersections: you understand how it works! Next time, try to draw a few extra shapes, the page is not full yet.

Keep up the good work, you are doing really good!