Hey there Blue! Welcome to Drawabox and thanks for your patience! I'll be going over your submission today, so let's get at it!

Lines

This is a decently strong start you have here in terms of line flow. Your marks are consistently smooth and confident, which is precisely what we're looking for. However, I will note that there is a great deal of fraying on both sides of your super imposed lines. This tells me that you may be going a touch too quickly, since you're not lining your pen up with the starting point of each line. Likewise, you tend to over or under-shoot your end points.

What you're looking for is a speed at which you're both comfortable, consistent, and accurate. Of course, we don't expect you to be there immediately, but this is what we're shooting for. Slow down a touch and utilize the ghosting technique so that you can achieve smooth lines without going too quickly. Once you have your flow down, go ahead and start using the ghosting technique (and make sure you're rotating the page) to line yourself up with the end-point.

Hitting the end point will be important later to sell the illusion of 3D form on a 2D plane, so it's not to be overlooked! However, you are quickly moving in the right directions, so just keep in mind what I noted here: slow down, and use the ghosting technique to help hone your accuracy!

Ellipses

These are strong, like your lines, showing a good deal of thought and control. They're sitting very snugly within the bounding lines of the planes, tables, and funnels, which is great! The only issue here is the same as the one with your lines - a very very slight wobble which indicates to me that you're going a touch too slowly. That said! The solution is the same: you can use the ghosting technique in order to iron that wobble out and hone your control with these marks.

Again, you'll be sacrificing accuracy, but drawing through your ellipses will allow you to tighten them gradually while also maintaining good flow.

With your funnels, keep a very close eye on the minor axis! You want your ellipses to be bisected and aligned with this initial line, as if it is the funnel's spine. This will be very important for later lessons when you're working with organic form.

Rough Perspective

Looking good here! You keep your verticals perpendicular to the horizon and your horizontals parallel which tells me you know how each line should behave. Likewise, your check lines are fairly accurate, so nice work there.

The big thing I want to point out is your tendency to go back over mistakes with an additional line. You want to nip that habit in the bud, because the additional line actually tends to draw the eye rather than cover up the mistake and a core lesson in Drawabox is allowing each line to be given the thought it deserves.

Rotated Boxes

This is a very strong attempt at the challenge. While your line-work is a bit sloppy, the boxes are fairly readable and you've drawn through them nicely as well. The major pitfall here is that you don't maintain consistently sized gaps between each box which leads to unnecessary guesswork. The key thing here is that keeping consistent gaps allows you to measure each box against the previous box, in both positioning and rotation.

Likewise, with your rotation - you get pretty close to the 180 degrees, but to ensure you achieve a fuller rotation next time, keep an eye on the VP. You want to make sure the VP is moving far enough past the VP of the previous box that the box is rotating rather than simply moving back in space. Overall though, this is a strong attempt, nice work!

Organic Perspective

So I will say that your mark-making could use a bit of improvement here (the overshooting is weakning the illusion of 3D form), but overall this is a good start. There's a bit of room for improvement in getting sets of parallel lines to converge evenly towards shared vanishing points, but that's nothing the 250 box won't help with!