Hi, Farhan. Congrats on finishing this exercise.

Overall you did a good job throughout this challenge. In some cases you still seem to struggle with the inner corner and, in the end, some of the inner lines end up diverging or converging too soon. This is especially hard when those inner edges are very close with the outer ones. Now that you've finished the chalenge, don't be afraid of trying new methods of construction in order to find a way that helps get a better result. Some people prefer to find the middle corner right before closing the last outer plane, but keep in mind that the depth lines should only meet in the vanishing point.

Another note: in these kind of exercises it's always better to number each box. Not only this makes it easier to check your own improvement, but also someone can easily point to a specific box if they needs to help you with something.

Feel free to move to lesson 2. Keep doing some boxes for warmups, as you'll need the practice by the end of the next lesson.