Starting with your organic forms with contour lines, these are for the most part looking very well done, except for the tendency to go back over lines you've already drawn, resulting in multiple marks to represent the same edge. While you should definitely be drawing through all of your ellipses (specifically because it helps us achieve even, elliptical shapes), your sausages (and everything else) should be executed in one stroke.

Aside from that, however, you've done a great job of sticking to the characteristics of simple sausages, and I'm pleased to see that your contour lines are fitting snugly within the silhouette of each sausage. One last thing to keep an eye on, is just to be sure that you're shifting the degree of your contour lines to be wider as you slide along the sausage, away from the viewer. If you're unsure of why the contour lines would shift wider/narrower like this, you'll find an explanation in the lesson 1 ellipses video.

Moving onto your insect constructions, there's a lot of good here - you're building your constructions up by introducing new, complete 3D forms and building up from simple to complex. There are however a few issues I want to call out to keep you moving in the right direction.

First and foremost, your use of line weight is kind of arbitrary. Line weight is one of many tools we have at our disposal, and it's useful to keep how those tools are used, what they're meant to convey, consistent throughout our drawings. For line weight specifically, it's best used to capture how different forms overlap one another, clarifying overlaps in specific, localized areas, rather than going back over long sections of a form's silhouette. So for example, here's how line weight would be used on two leaves to help establish which one's on top.

In general, line weight shouldn't be built up along with the rest of your construction - if you add line weight throughout the process, you're going to end up painting yourself into a corner, with thick lines where you ultimately may not want them to be. Instead, keep the weights of the marks from your various phases of construction consistent, and then go in once your construction is done to add a touch of line weight here and there to help clarify things for the viewer. Doing it all at the end will ensure that you don't add weight where it'll undermine the illusion you're trying to create.

For the most part, throughout your constructions, you've done an especially good job of building up your constructions by introducing new, solid, three dimensional structures at every step. This is actually something that students sometimes struggle with, and I often see them making the mistake of treating their drawing as just a series of lines and flat shapes when it suits them - basically allowing them to quickly alter the silhouettes of the forms they've drawn, rather than building upon them with more 3D forms. The result however is that, as shown here, altering the 2D silhouettes like this causes our constructions to flatten out.

I only noticed one place where you did this yourself, and it was really minor - specifically here where you started with a larger abdominal structure there, then cut back into it when adding the segmentation. Instead, that segmentation should wrap all the way around the existing structure, bulging out from it rather than cutting into it. You can see some examples of this with how the segmentation was added to this shrimp from the informal demos page.

While you're handling the rest quite well, I will still share with you some of the demos I provide other students with who are struggling with this - just in case they help further solidify your understanding:

The last point I wanted to call out was that I noticed that you seem to have employed a lot of different strategies for capturing the legs of your insects. It's not uncommon for students to be aware of the sausage method as introduced here, but to decide that the legs they're looking at don't actually seem to look like a chain of sausages, so they use some other strategy. The key to keep in mind here is that the sausage method is not about capturing the legs precisely as they are - it is about laying in a base structure or armature that captures both the solidity and the gestural flow of a limb in equal measure, where the majority of other techniques lean too far to one side, either looking solid and stiff or gestural but flat. Once in place, we can then build on top of this base structure with more additional forms as shown here, here, in this ant leg, and even here in the context of a dog's leg (because this technique is still to be used throughout the next lesson as well). Just make sure you start out with the sausages, precisely as the steps are laid out in that diagram - don't throw the technique out just because it doesn't immediately look like what you're trying to construct.

Overall, your work is definitely coming along well, though you do have some definite points to keep in mind as you move forwards. I'll go ahead and mark this lesson, so keep them in mind for the next lesson.