Sorry for the wait on your critique - you submitted right when our promptathon started, and having been burnt out from 3 weeks of unexpected traveling, catching covid, and finishing up prep for the promptathon while sick, I ended up taking the promptathon week to recover. But anyway, enough excuses - onto your feedback!

Starting with the structural aspect of the challenge, I'm pleased to see that you've been mindful of building out each wheel with several ellipses, allowing you to create the gentle arcing profile for the tire that tells the viewer of its inflated nature, and that if dropped, it'd land with more of a bounce rather than a heavy thud. That said, I did notice a couple of issues in how you were handling the spokes of your wheel's rims.

As shown here when drawing the side planes of those spokes, you'd extend the farther edge as far as the edge closer to the viewer. The farther edge should be cut off sooner, where it intersects with the wall of the inner rim. Additionally, when executing these smaller marks, you had a tendency to set aside the principles of markmaking from Lesson 1. Your linework gets a little scratchy at times, which suggests that you're not applying the ghosting method as consistently as you should be - not everywhere, but in a lot of your wheels, especially when dealing with the tighter, smaller elements.

Continuing onto the textural aspect of the challenge, this part tends to serve as something of a trap. Being as far removed from Lesson 2 and its textural principles, it's not at all uncommon for students to largely forget about the concepts of implicit markmaking, and of using cast shadow shapes in order to suggest the presence of the textural forms on their tires. In such cases, they'll fall back to explicit markmaking, where they focus either on outlining/constructing the textural forms themselves, and doing so directly, or where they focus primarily on drawing what they see, mark by mark, rather than focusing on each individual textural form and considering how it relates in 3D space to the surfaces around it.

This by and large appears to be the situation that you're falling into, so I strongly urge you to review the Lesson 2 texture material. Review all of it, but in particular the reminders here touch upon the main issues that I'm seeing.

In addition to this, also take a look at this diagram which explores a common mistake when dealing with textures relating to holes, grooves, cracks, etc. - really any situation where the "named" element corresponds not to an actual physical form, but rather to negative space, or an absence of form. In such cases students tend to want to simply draw them directly and fill them in, rather than considering the textural forms in question actually being the walls that surround these empty spaces, and cast shadows upon one another's surfaces.

Now, as that element of the challenge is something of an intentional trap, it's not something I hold back students over, or assign revisions. Rather, it's just an opportunity to highlight that certain elements of the course material may have been forgotten, given that it's such a lengthy process, and so you should definitely go back and review it, as well as anything else you think may have gotten lost in the mix. Honestly, periodically reviewing the Lesson 0 material is always worthwhile as well.

With that, I'll go ahead and mark this challenge as complete.