Thank you for the feedback.

I struggled with the ellipses, perhaps because i was using a combination of this method and an a previously learned one (which is more suitable to sketch with light pencil lines andmore forgiving).

I'll keep practicing them.

The rotating boxes did disorient me after a while. i was trying to make sense of the neighbouring lines and perhaps closed the gaps too much/ placed them to close together and losing the rotation.

Funny that you say the organic perspective is very good, because i had no clue as to what i was doing and still find it the most confusing exercise. Perhaps because it is mostly guesswork. but i was more happy with the last attempt as i did seem to make much more spatial sense in my opinion.