lines

Superimposed lines looks great. They look straight and the lines fray only on one end.

Ghosted lines, solid. The lines looks confident and straight. There might be not much wobble but i can see that there is an arching. This could be because you are still not used to using your elbow.

Ghosted planes. Great. Pretty much the same as ghosted lines.

ellipses

Table of ellipses, Ellipses looks confident. Ellipses are drawn twice and confined within the box's boundary. Ellipses touch each other and the spacing is tight.

Ellipses in planes. Some ellipses are not making use of the full space within the plane. Make sure to fill it as best as you can. And there is also some overshooting. Other than that, i think you ellipses are good.

Funnels. Though there are some that is slanted, they generally looks ok. Make sure to align the ellipses straight with the minor axis in mind.

boxes

Plotted prespective. There are some overlapping boxes but generally are good.

Rough prespective. There are some arching / uneven lines on the back planes but i think you did great. You did the homework according to DaB instruction, with extended lines not surpassing the horizon line. Remember that horizontal lines should be parallel to horizon and vertical lines perpendicular to horizon.

Rotated boxes. The corner boxes seems less rotated and this create the effect of the middle boxes looking a little flat. With how much.you are rotating. It wouldnt be hard to add a 4th box just to fill in the gaps. Other than that i think you did great. edit : Here is a reference on drawing rotated boxes.

Organic prespective. The boxes looks ok. Most of the box converge into a vanishing point. The scale of boxes here are also good. One thing i will point out that your lines seems to double on some areas. Im not sure if its line weight or redrawn lines. Lines should only be drawn once.

I hope this wasnt harsh and take my critique with a grain of salt. and excuse my grammatical errors, english isnt my native language. Imo i think you are ready to take on the 250 box challenge! Good luck :)