Starting with your organic forms with contour lines, these are largely well done. Just make sure you keep trying to get closer to the characteristics of simple sausages from the instructions. You're not far off, but you do have a slight tendency to stretch out the ends so they're not entirely circular, and to let your forms get a bit wider through the midsection.

Moving onto your insect constructions, honestly you've done a pretty good job overall. There are some small issues I want to draw your attention to, but overall you're showing a strong awareness of how every element of your construction is made up with simple, solid, 3D forms. As a result, your drawings tend to feel very solid and believable as 3D objects rather than just a series of lines and shapes on the page.

I especially loved this mosquito - each major section of the body feels bulbous and voluminous, and the way you've added the eyes to the head structure as separate 3D forms really helps bring it all together.

Now one of the big issues I do want to bring to your attention simply just speaks to the odd case where you don't quite adhere to those principles - where you stray from working strictly in 3 dimensions, and end up taking little shortcuts that threaten to undermine what you've built up so well.

Let's look at this part of the australian walking stick's leg. The key problem here is basically something from Lesson 3 - you should be building those spikes directly onto the previous phase of construction. You started with a simple shape, and you need to just be adding the spikes onto it. Otherwise, zigzagging as you did, breaks the third principle of construction.

Now, this does actually give me the opportunity to explain something a little different. What we're essentially doing here (even when doing it correctly) is adjusting the silhouette of a form. This works just fine when working with a relatively flat shape, like a leaf, or like this weird insect's leg. But if it had volume to it, and wasn't so flat, we would no longer have this option. This sometimes comes up in Lesson 3, so I've got this example involving cactuses to explain it. Also, this diagram explains why altering the silhouette of a form (either by cutting into it or extending it) flattens it out.

Basically unless you want the result to come out flat, avoid altering the silhouette of any 3D form you've drawn. Instead, to introduce changes (like a bunch of spikes) we'd add new forms for every such addition, and either define how it intersects with the existing structure with a contour line, or specifically shape its silhouette so the new form "wraps" around the existing structure. You can see this in play in this beetle horn demo and in this ant head demo.

Just to be clear though - I'm explaining a common mistake, but you actually haven't made this one at all in your work (at least not that I could find).

Aside from that, your work is looking great. The last thing I can think to offer are some examples of how you could build on top of the sausage structures you're employing when building your insects' legs. [As shown here](), when you need to add bulk to particular areas, you can wrap additional masses around them (pretty much the same as what was discussed before about additive construction). This can be used to capture a lot of the subtler form information like on this ant leg, and will come in handy throughout lesson 5 as shown in this dog leg.

So, with that, I'll go ahead and mark this lesson as complete. Keep up the great work.