I can definitly see improvement toward the middle and end of the challenge. As you already noted, just continue to focus on avoiding exssesive forshortening.

One thing I found helpful is to aim to draw your lines perfectly parellel because when I tried to conciously apply foreshorting I always overdid it, but when I aimed to draw them parellel the boxes looked much more natural and still came out having very slight forshortening, correcting my previous mistakes.

Overall, great job!