Candlelight

The ellipses you have drawn in the tables and in the planes are quite wonky and uneven looking. Also the ellipses in the funnels exercise are not correctly sized and are a little off center; the ellipses on the funnels need to be the same size on each end of the major axis (the short line across), and correctly orientated along the minor axis (the long line down).

Lastly, the lines on the 'Rough Perspective' exercise are wonky, and lack clear, confident strokes.

You can leave these exercises for now, but if you want to you can add some of them to your warm ups before you start homework.

The boxes is more about scaling and orientation than lack of space. The overall shape of all the rotated boxes should be more circular.

On the 'Rough Perspective' exercise make sure in future to draw lines with confidence and following the horizon line, as sone of the lines are a bit wonky. Also on the 'Rotated boxes' exercise the boxes drawn should turn in perspective around the center box (which they do not here), so make sure they are turning in perspective by paying attentio to the convergences of each box and to use neighbouring edges as hints when adding new lines.

As mentioned before, some of the elipses are a bit wonky, so more focus on ghosting and ensuring they are more elliptical could further improve them. Also I would refrain from dooling on the lessons and rather in the other 50% of time you allocate to drawing for fun.

I think you can move on when you have completed a lesson, but to get a completion badge you need several people to agree to mark it complete (sorry for the late reply).

I later made an Imgur (this should hopefully be better): http://imgur.com/gallery/PVOjwXb

On the 'Tables of Elipses' exercise, the degree of the elipses is not always consistent, so it is important to make sure each in a row have the same alignment.

Also on the 'Rotated Boxes' exercise, the boxes are a little too cube-ish (they are meant to be tapered boxes) , and they are slightly wonky, getting more skewed around the outside. In future make sure the boxes taper and use the neighbouring edges of the boxes to estimate the position of the other edges that are soon to be drawn.

In my opinion I think you should do what you want. Reading Lesson 0 in regards to the 50% basically says to draw things you want, even when you lack the skill.

Watching and following tutorials is a good idea (I have been looking at some portrait tutorials), but I would not stress too much. I don't know much about jewllery, but I found some tutorials on YouTube:

https://m.youtube.com/watch?v=Szw9ki8UAZ4

https://m.youtube.com/watch?v=67A8uRFU920 (she starts at the 1:15 mark)

Maybe the sphere could feature a highlight on it? Also the cube could use its own cast shadow, as it looks a little flat.

For my criticism on the three sections (firstly on the Funnels exercise), make sure to put the short major axis in, as it is not present in the drawing. Some of the lines on the Rough Perspective exercise also appear to be drawn multiple times, when they are only meant to be drawn in one, consistent stroke, so make sure to only do the one stroke (though you still can use ghosting).

Furthermore in the Rotated Boxes exercise the center box is a little too thin and needs to be more squarish, with the height and width equal to each other.