They look great! I think they'll look even better if you go back in and clean up the outlines with a darker pencil. Some variation in line weight will help too :)

That is cool!

You may have had an easier time if you started with simpler blue blobs. All the blue lines you drew for the contours and gestures of the figure are extra noise for this assignment. It looks like you got the boxes right though. The final drawing look great to me. Next time, just don’t over complicate things at the beginning.

I think you are on the right path. The robot clearly looks like a robot with shoulder joints and everything! "my hands are just too dumb to do what my brain knows" This is such a perfect example of discovering something and starting to practise it. The brain has taken a step forward but your muscle memory has to catch up now. Your brain is now able to judge the outcome and give your self critique (which is useful). You just need to practise more! I think the cylinders look real if you view them individually. But they might look off if compared to the rest of the objects around it. So try NOT to rush through the initial box phase and make sure that the box aligns correctly with the other boxes around it. Use the ruler if you have to. In Procreate you can draw a line and leave your pen on the tablet and hold it still. After a few sec the line will become straight as if drawn by a ruler. You can try drawing something by first making sure that the boxes are correct. Mark specific vanishing points on your canvas and draw all the lines straight to the corresponding vanishing points. You can later erase them or create a new layer on top of it. You can soon start skipping some steps of this tedious process once you build up muscle memory.

This is only hinted at in the current videos, but likely will get covered in future videos. I will try to give an explanation anyway. Short answer is that you can't place an object outside it's vanishing points. The box shape gets so deformed that it breaks the 3D effect of your drawing. So for current exercises consider the vanishing points to be the edges that you can still draw objects on, but don't go past them. A bit of a longer hint for what's likely to come: Stan already showed an example of stacked books. These books got their own set of vanishing points because they were rotated compared to each other. Once we learn more about different objects having their own sets of vanishing points THEN you will be able to place an object outside of some vanishing points and "generate" new vanishing points for that specific object. What I mean by this is that currently we use two vanishing points for the entire drawing BUT in the future you will use vanishing points per object. Some objects will share vanishing points if they are aligned like a set of houses on a street. Some objects will have their own set of vanishing points because they are rotated compared to the houses like a car parked diagonally in front of the house. By that time you will likely think about your vanishing point placement for the entire scene AND decide if the next object you are about to draw will need its own set of vanishing points. This may sound like a lot of work to do for every object, but as Stan said: you will develop a feel for it and you can totally eyeball it OR you can go super mathematical if you want maximum precision for your technical illustration (likely would need perspective specific course for it)