Your lines look decent. For those I'd simply try to tighten up your lines, but that'll come with time and practice. Some of your ghosted lines look wobbly, which is bad. Even curved lines are better. You might want to spend more time ghosting before executing the line. The ghosted planes need refinement with your line straightness and accuracy, which is off . You also didn't do all the lines for some of them. Your ellipses are the same as your lines, just tighten them up. You got the same issue with your ellipses in planes, just work on them. Your funnels lack variation, all of them have the same minor axis. I'd practice more with those. The only issue i can see with your plotted perspective is that you did not properly thicken the box outlines, the outside edges must be darker than the other lines. Rough perspective is rough, spend more time ghosting and visualizing your VPs. Your rotated boxes look way better than mine, I can't say anything. Your organic boxes kinda look like they're melting, which seems to come from poor converagnces. Remember that all converging lines should meet at the VP, and that only lines going away from the veiwing should converge.