Starting with your organic forms with contour curves, these are really well done. The contour lines wrap very nicely around the forms, and each one has been kept to the characteristics of 'simple sausages' mentioned in the instructions. Very well done.

Moving onto your insect constructions, your work here is similarly well done. You're largely doing an excellent job of applying the principles of construction to build up forms from simple structures, gradually adding more of them to take them to greater heights of complexity and nuanced. In doing this, you've created insects with very complex silhouettes that still feel entirely solid and tangible.

You're also not afraid of drawing through your forms, and as you do that, you demonstrate considerable control over line weight to help avoid your drawings from getting cluttered and difficult to parse.

I did notice that sometimes you seemed a little uncertain on how to approach adding additional forms that wrapped around the sausages of your insects' legs. For all intents and purposes, you were actually doing a pretty good job of this in many aspects (you were mindful of how they curled around the underlying sausage structure), though this diagram may help to guide you in this. The key thing that I noticed was that your additional masses would often stop suddenly, creating a bit of a jarring bump in the silhouette of the form. While it is proper for these additional masses to create a visible pinch in the silhouette (as I demonstrated for another student here), the really sudden stops seem somewhat unnatural. The way you constructed them is entirely proper, it just makes me question whether or not it reflects your reference accurately.

To the point about the cast shadows, I certainly did notice that you seemed somewhat unsure of how to approach them in some cases, like this drawing. The key thing about shadow shapes is that we don't have to be hyper accurate in following the structure of the object. The shadow's purpose is to help ground the drawing - that is, to establish where the ground is in relation to the object. In order to achieve this, we need to be aware of where the source of light, the object, and the ground are in relation to one another, then consider in loose terms what area on the ground the object is blocking the light from reaching. Here's how I'd approach it.

Aside from that, your work is very well done. Despite your self-described confusion in keeping everything straight, you are demonstrating a well developing grasp of 3D space. I'll go ahead and mark this lesson as complete, so feel free to move onto lesson 5.