Lines:

your lines are confident but they have a slight tendency to bend especially towards the endpoints which becomes more noticable in your ghosted lines, planes and boxes.When you were drawing a line it looked like you would course correct when you realized you weren't going to reach your distination. Your ghosted lines, planes and boxes also show accuracy issues. Remember when using the ghosting method and shoulder pivot try to focus on making the movement with your shoulder instead of making the mark on the page.

Planes:

Ignoring your linework problems your planes are very good a must commend variety of planes you have made. You used forshortening and understand how the center of the plane can change because of this

Ellipses:

Isn't anything I feel I can criticize they are tight, accurate, and confident which is very good

Boxes:

Aside from your linework I don't think I can critique anything you have some issues with perspective but those are expected. The purpose of the 250 box challenge is to iron those out be so don't hard on yourself regarding your rough perspective attempts.

Good Job I think you are ready to move on. Just be sure to add ghosted lines, and planes to your warmps