No problem.

To quickly address your questions:

How do I forshorten the negative space?

Much like how your arrows grow in size as they get closer to the viewer, so can the space between the curves (this is the negative space) as demonstrated in the link I provided in your critique.

I find drawing consistent 'sausage like' forms very tricky, and get confused about the degree of contour ellipses because the forms aren't tapered or foreshortened.

Ultimately we don't expect you to be perfect at any exercise during your first attempts, you'll improve as you build mileage. Something to keep in mind however is that you determine the shape of your forms, if you create stronger contour curves along the form's length it will imply that that the form is rounding, also demonstrated in the link I provided in your critique.

I found this exercise incredibly difficult and painstaking. It's very hard to work out the cast shadows, so any more advice would be helpful

Textures and form intersections are the exercises in this lesson that we expect most people to struggle with, they rely on your understanding of 3D space so you'll hopefully see improvement in ability and understanding as you progress through the course as most people do. The goal of the challenge is to think of how forms created by the texture exist in 3D space and how light would behave with them. You decide where your light is and which shadows you create to imply the existence of those forms, if you're working with scales you don't draw the scales themselves you draw the shadows created by those scales to imply that the scales are there. Being able to decide what information you can imply helps prevent the viewer from being overwhelmed from too much visual information and can allow you to draw people's eyes by changes in the density of detail.

I thought my forms were all in one big group. Also, I agree the intersections are very difficult and I'm not totally clear on how they are supposed to work based on the video and accompanying notes.

On your first page of form intersections you have a box in the top left by itself, a box in the bottom right by itself, and 2 separate groups of 3 boxes. All of these should be intersecting in one large group, instead they're multiple groups (or by themselves). As for your understanding you'll hopefully find them easier as you progress in the course where you begin to deal with forms that are a bit more concrete and understandable, like how legs join to a body rather than an assortment of random forms floating in space.

Organic Intersections: Again, a tricky task and I'm not quite sure how to correctly show a cast shadow on such forms.

Pick where you want your light to be, it's easier in one of the top corners than right above, then think about how the light is blocked by your forms and create shadows based on that. It may sound like an obvious answer but it really is just a matter of thinking about the space you're creating and how your forms behave in it. I will quickly add though that just because the answer may be obivous, it doesn't mean it's easy. Again we expect you to improve as you build up mileage. Looking at your attempts again, on the first page some of your forms are just collapsing into one another rather than wrapping around behind existing forms once they're obstructed by another form. You should be drawing through all of your forms and thinking of how each of these forms interacts with one another, if you drape a sausage over another it doesn't disappear, that mass needs to go somewhere. With that in mind you can think of how the shadows interact and wrap around the forms below as well. In the top left of the first page you have shadow that goes all the way up the left side of the form and then is just left floating in the air which shows you need to spend more time thinking about how these things exist.

As for your revisions themselves:

• Your organic forms are looking much better but there are 2 issues I need to point out. The first is you're not drawing through your ellipses which is something I called out in your critique. The second is you should try to push your curves so they hook back into the form more as discussed here.

• You're still highlighting existing edges at times rather than creating new ones via your intersections in the form intersections attempts. That said, I can see that you're thinking about it more and trying to place new lines at times. Again we don't expect you to nail this the first try but we do want to see you try and you did here, good job.

I'll be marking your submission complete and move you on to lesson 3.

Keep practicing previous exercises as warmups and best of luck.