One of the pages of ellipses in a plane is missing. The ellipses are a little too loose in the table of ellipses and the funnel exercisess. I'd suggest you ghost more and while ghosting make suer the pen doesn't go over the edge while ghosting, you should also go over it a few times (like you did for the ellipses in planes exercise).

For the boxes, the rotated boxes look great but you haven't drawn the ones on the edge. Ploted perspective has no problems. Keep in mind that when doing the plotted perspective exercise you should make sure that your extend all the boxes the vanishing point.

I'd suggest you redo the organic perspective because you have a lot of boxes where the edges are diverging instead of converging. If you wanna you can also try and redo the tables of ellipses cause they are too loose, try to use the same divisions as shown in the examples.