Hi! Let's see:

Your sausages are looking better, and the degree changes are visible now. They still get squished on the ends, so keep working on that on your warm ups, in the next lesson you'll use them a lot. Remember to think of them as two spheres joined by a tube.

Your insect is looking a lot better, especially the thorax with its legs. Now they look more believable and solid. The end section of the tail looks good too, with its subdivisions following the contour of the form, all build up from a basic structure.

Now, things to correct. For starters: if you look closely the tail of the dragonfly, it also has subdivisions, just like the end section. When you work on the next lesson try to work with the best available photos; as focused as you find them, because when they're blurry it's difficult to figure out certain sections.

You have a tendency of adding forms without considering the way they interact with the surface they're put on. In this example, you see that when the lines curve and accelerate as they approach the end of the sphere, that tells me that the surface is spherical; remember what was told at the beggining of Lesson 2: this whole thing is a lie, and we have to be coherent with what we say in our marks, so that the lie is believable.

Something similar happens with the intersections of the legs, they're just like a contour curve on a sausage, so you have to be careful and consistent when adding them, as that will tell you how the surface of the form behaves. The eyes in this insect work in a similar manner as the sausages; if you look closely, they're mounted on another form, and the one that's away from us interects that form. It's ok how you put it, as we said, it doesn't have to look exactly like the reference, but an intersection line with the head would've shown us better that the eye is a 3D form and not just a circle.

I modified and added some lines to the neck, so that we can sort of replicate that boxy link between craneum and thorax. In hindsight, maybe it would've been useful to add it to the initial construction.

Finally, your wings a similar issue; it looks like the main thing to improve is the understanding of how contour lines and intersections work. Your wing is fine; but the complexity you added reads more as a flat line. The supporting structures are fine as well, maybe a contour line to reinforce them would be useful.

I think you understood the lesson and so, I recommend that you move on to Lesson 5. However, I'd keep working on those sausages and their contour lines. In the next lesson you'll have to add a lot of masses and intersecting forms, so don't forget to re-read those lessons if you have to. That's the main issue I see in your drawings.