Hi, FrankMasih

Good job on your work here. Since this is a very good submission, I'llf ocus on the aspects you need to improve.

A few of your ghosted lines, specially some of the longer, have a noticeable arch in them. Remember to draw them with a shoulder motion in order to attempt to reduce this.

On the rough perspective exercise, some of your boxes are not well aligned with the horizon. Remember that all the horizontal lines should be parallel to the horizon and all vertical lines should be perpendicular to it.

Some of your rotated are not actually rotating, as they are sharing the same vanishing point. This happens specially on the left side of your work.

Your organic perspective has nice compositions, and the perspective is overall good. The negative aspect is that in some occasions you are repeating your lines. While this can be done in order to increase the line weight, it should be only on the lines that are actually overlapping and with a a subtle stroke. Going over the same line only once.

Good work here. I feel you're ready to move to the next challenge.