Very nice work overall! Just a few suggestions to call out:

• Always remember that we're building up simple 3D forms and then whittling them down - in cases like this where we're dealing with a lot of grid lines, it's easy to shift to thinking more in terms of stitching a bunch of individual edges together to create the end result. This can cause us to pay less attention to applying principles like this one about handling curves in Lesson 6 where it's explained that it's best to start out with boxy forms, and then round them out later on. While you handled this section of your car quite well, that's definitely an area where starting with a simple box would still have been useful in terms of the exercise we're performing (less so in improving the end result, as your end result is quite good).

• For these pieces that sit above your wheel, keep in mind that you've depicted them as being paper thin. Generally speaking while there are situations where you may want to convey something to be paper thin, it's not all that common. It's best that when you feel inclined to draw something in such a way, that you take a moment to think about it so it is an intentional, purposeful decision made for a reason. In this case, giving it a bit of a side plane would be a good idea, as it would make the structure appear more solid and believable.

• For your wheels, I can see that you built your ellipses inside of a plane for one side of the cylinder, but not for the other. In addition to this, for the wheel on the side of the viewer, the outer ellipse was placed in the plane, but for the opposite side, it was the inner ellipse, resulting in slight (admittedly inconsequential) asymmetry. Definitely not a big deal, but be sure to keep those things consistent (in terms of their relationship to your basic grid), and in general build up a box with planes for both sides so each ellipse has a plane in which to sit. Again, like the first point, this comes down to what is best in terms of the exercise we're performing - how you approach your own drawings is entirely up to you.

Anyway, all in all great work. I'll go ahead and mark this lesson, and the course with it, as complete. Congratulations!