Hello I’ll be handling the critique for your 25 wheel challenge.

-Starting by the structural aspect of your wheels, I think you are aware of the bump that is present on the middle of the wheels that helps them to look inflated. There are certainly a few cases where it seems that the wheel is a straight cylinder like on wheel 14, I have to acknowledge that adding this ellipse can be quite tricky if you are freehanding, so I would have recommended you to stick to the ellipse guide.

When it comes to the other structural aspect of your wheels, which are the rims and spokes I think you could do a much better job. RIght now it seems that you are drawing them as simple straight lines, so it is important to define their outward faces as well as the sides planes. I did notice some examples where you filled those side planes with black, but keep in mind that areas of black should be reserved for cast shadows only, this falls more on the area of form shading. And this leads to the other aspect of this challenge.

This challenge serves as a reminder of the concepts we learned in the lesson 2 texture section, most students by this point will have forgotten most of it, so don’t worry if that’s the case for you as it is completely expected.

Taking a look at your wheels I do notice that most of the textures of the tyres are explicitly drawn.

Here is a diagram that actually explains this point pretty well https://imgur.io/SEwsEfO , on the top you have the textural form with its outline and planes drawn explicitly, and below them on the second row you have the side planes filled with black which falls under the category of form shading

(just like you did on the spokes), and on the right you have the cast shadow example which is the correct one.

There are a few cases where you seem to be moving in the right direction like on wheel 19, where it seems that you are more deliberate when it comes to drawing those cast shadows.

But most of the time you are actually using lines when the texture consist of shallower grooves, it is a common mistake to think of the grooves as being the forms themselves, but this is no the case, just like any other holes (like in a sponge texture) are not forms - they're negative space, empty space, and the forms in question are actually the walls surrounding them. This diagram helps to explain the distinction. https://imgur.io/SCnATRK .

My main recommendation for you is to first outline the shadow shape while thinking about the form casting it and how it wraps around the surface it is falling on, once you’ve done that you can fill it with black, this will help you to form a better understanding of how all of this comes together. Here you can see a good example https://imgur.com/oAx2pRD .

Okayy so that should be about everything I wanted to talk about, while there were some mistakes I won’t be asking for any kind of revision as it is completely expected of students to make those mistakes.

I’ll just go ahead and mark this lesson as complete and let you move on to the last lesson. Good luck!!!