Hello there Barphil, I'm Reboot, And I'll be critiquing your work! I'll be dividing the critique into three neat little sections, Lines, Ellipses and boxes.

LINES-

Superintendent lines - Your lines seen to be pretty accurate, although they are very wobbly. I can see this in the later exercises aswell. Remember that a line that is not accurate is still more useful than a wobbly one, this is especially true in later lessons, so you would want to practice fluency of line over accuracy.

The cause of this is that you are hesitant to make a stroke. You are probably not moving your hand fast enough. You see, what is happening is that when you go slowly your brain picks up on any inaccuracy in the lines direction, and you either consiously or subconsiously autocorrect the line. When you make a fast line your brain doesn;t have time to see if you go of track or autocorrect, whats done is whats done. This also makes ghosting(the planning step) More important.

Ghosted Lines- your lines don't arc, but thet are still ver hesitant and unfluent, for which ive already given the fix for above

GHosted planes- Your lines dont wobble ass much but do arc, the main reason for this is that you probably are not suing your shoulders. On the other hand some people have a natural tendency to arc their hands motion(me for example). If thats the case with you then slightly arc it in the opposite direction, one thing that helped me is to see how may hand actually moved while ghosting.

ELLIPSES-

Table of ellipses- YOur elipses seem pretty smooth, although sometimes they dont touch all ends. Sometimes the ellipse tapers to a certain end. THis si as the speed isn't consistent. When drawing the ellipse, the speed of drawing it should be consisten all the way through

Ellispes on planes- YOu have done a better job of keeping th ellipses within their bods here, although there is still tapering and some of them look hesitant

Funnels- Remember that the minor has to be perfectly in between the c curves, in the funnels where the minot axis is in a correct position the ellipses seem to be aligned pretty well.

BOXES-

ROugh perspective- You have done a good job here, alothough the lines are still wobbly.

Rotated perspective-This seems pretty good, you get the general idea. Some of your boxes seem incredibly big while others are normal or very small

Organic perspective- once again this is pretty good, sometimes the lines diverge from thep vp but you have the general understanding

Overall- your boxes are very well done, ellipses are pretyy good and lines coul use some tweaking

          YOu have done a very good job, godspeed to you and goodluck on your artistic endeavours