Hey there, congratulations on finishing your 250 boxes! You have made a lot of great progress with these boxes. Comparing your first pages to your last ones your line quality has improved, your handle of converging lines, and overall sense of three dimensional space is definitely better. I want to point out the hatching lines as they illustrate a few good things. First of all, the line quality has improved immensely and there aren't any wobbles and hyper-control of the pen tip like in the first pages this is a great thing. Secondly, the lines all have an overall arc to them showing that you could still be using your shoulder a little more, especially since in this case the arced lines give a sense of a bulging face instead of reinforcing the planar nature of the box face.

Moving on to your actual boxes, like I said before your converging lines have gotten a lot better. As is expected at this stage, there are still some issues with the back lines getting skewed off from the overall convergence of your lines, but that's ok and is why uncomfortable has made this infographic to further elaborate on how we should approach these lines to keep them more...in-line with their neighbors, no pun intended. Give this a read and if you have any questions let me know, but I will go over the general gist of it. Essentially, all parallel lines in perspective are a family and they are related to each other via the vanishing point they share. The location of the vp determines the angles between them, as illustrated in the infographic. When you draw things made of parallel lines (a box has 3 sets of 4 parallel lines) you must draw each line with all of the other parallel lines in mind. They are all going to a shared vp and they all have angles between them determined by how far away this vp is. Normally beginners start by drawing a single plane making sure all the convergences are good and then as they go to the next plane they draw it in a vacuum with no consideration given to the first lines they drew which often results in two points of convergence instead of one. So with this information continue to practice boxes in your warm ups while considering all of the other parallel lines and in time you'll really hone in those "back lines" to converge consistently.

Overall though you have followed directions in applying your correction lines at each page and applied what they taught you to your following pages and have shown considerable growth. I will be marking this challenge as complete so you are now free to move on to lesson 2, congratulations!