Hello, I'm tawny_0wl and I'll be critiquing your work today!

Lines and Planes

I see some fraying on both ends of the superimposed lines, I recommend you take your time and place the pen in the correct location before proceeding.

Fraying on the far side is normal and is expected if you're executing the marks confidently and maintaing trajectory.

Besides that, your lines look fairly confident.

Ellipses

You drew through them twice and kept the shape fairly even. I'm assuming you used the ghosting method.

Your ellipses are snug enough in my opinion. Yes there are some gaps and it's good to identify mistakes and areas you can improve on, but don't get too hung up on the ellipses not fitting perfectly, accuracy comes with time and practice.

Good funnels. Ellipses are aligned to the minor axis line. I like that you tried to vary them too.

All in all, well-executed exercises.

Boxes

Plotted perspective looks clean. In the Rough Perspective exercise, I see some wobbly lines/hesitation. I suggest that you ghost through the motion more, engaging your shoulder, as many times as you need to get used to the motion and draw a single, confident line. Line extensions were done correctly, remember to also keep the back and front planes of the boxes rectangular.

Another thing, for this exercise, the vanishing point should be positioned more towards the center of the frame, you tend to stray a bit too far from the center.

The Rotated boxes exercise is tough, but you are consistent in your work and the boxes don't diverge that much. Props for completing it and not giving up.

Nice rotations in the Organic Perspective exercise. Well done!