Hi, good work! You can try drawing ellipsies inside of squares that are in perspective, so that you can get rid of those sharp corners. Or maybe try drawing a few cylinders inside of boxes. Also try doing overlaps (or maybe it's called overhang) where the smaller cilinder meets the bigger one, so it's clear how they interact. And also keep in mind that the cylinder should keep the same hight (that's why the blue lines have to be paralel) Hope it's not too confusing. (sory for my grammar) Keep up the good work.