1. Lines: There is a fair bit of fraying at the end on the superimposed lines but the lines are straight and confident. The Ghosted Planes are pretty accurate.

2. Ellipses: The ellipses start pretty rough on the first page of Ellipses Table, with lumps and the looping around overshooting, but they improve massively with each new page. By the time they get tot he Funnel the are smooth and second pass overlaps the first nicely.

3. Perspective: Plotted Perspective is fine. With the Rough Perspective and Rotate Boxes, while the perspective part is fine, the actual lines are rather wobbly, which is odd becasue the lines nice and straight in Line exercise. The Organic Perspective is works really well. Even if not all the boxes are perfect (they never are) the 3D flow comes across really well.

I've already agreed with Polarshifts' critique below, but I do want to mention something.

You should work to make the borders on your windows more apparent. I could barely tell they were there. I'm not sure if it's the lighting or the pen you used to draw them, but in either case, that's something that you should be wary of.

I also notice that you tend to draw rather small on your pages. This jumps out to me most on the funnels exercise, where there is quite a bit of empty, unused space. I may be wrong about this, but it seems that you're using pretty big paper. Assuming that this is the case, I'd recommend using smaller pages if you can, so that your exercises don't have to appear so tiny. The flaws in your work will be harder to pick out if your work is small, which will make it harder for people to offer the best advice.