Starting with the form intersection exercise, these are generally well done. The forms are drawn as if though they were to exist in the same space - there are no streched forms or dramatic foreshortening present.

I've taken some notes on the intersections themselves and these are a few that stood out as being incorrect.

  • On the upper left corner, on the sphere-cylinder intersection, the intersection going along the front face of the cylinder is correct seeing as the sphere itself has an intersection that runs along the curvature of its surface which is the way it's supposed to be. However, that curvature should then be followed by a more sharp and sudden 90 degree angle transition as we move along the side of the cylinder. From there, we take the same approach in this case. Since this curve runs along the side of the cylinder, a simple c surve is sufficient.

  • On the center, on the cylinder-box intersection, since this interaction happens along the side of the cylinder, we expect to see some slight curvatures as we move from one face of the box to the other while keeping in mind that it's a sudden 90 degree transition as well along the box's edge.

  • This last point has more to do with what might be holding you back since there are a few instances where theres a bit of confusion going on when placing the intersections themselves. In this case, I'd suggest hatching the front sides of your forms. This would help establish the configuration more specifically.

Besides that, I wanted to show you this form intersection diagram as it helps explain the intersections that exist between different pairs of surfaces, rather than in a specific memorizable way between pairs of forms. It also explains how those intersections change as we replace a hard edge with a rounded one.

While these are points worth keeping in mind, it's nothing that would require revisions since you'll be doing more of these later on in lesson 7 but I do think it best to work on them in your warmups.

Moving onto your object constructions, these were generally well done and shows a thorough use of subdivisions. You're taking your time in identifying each step at a time rather than figuring them out by eye. There are a couple (albeit minor) things I want to call out that have to do with your orthographics in particular.

  • In this gas can construction there were a couple of parts where your subdivisions were well done but left out additional subdivisions for more specific areas marked in red. Although not present throughout, I thought it was worth mentioning as this is something you will be doing more of moving onto lesson 7 when working on mirrors, license plates, bumpers and such. Of course it is a matter of what you choose to include in your orthographics but generally it's best not to add parts onto your construction if it's not already in the orthographic plan, which brings us to the next point.

  • In this tape recorder you've added borders on your construction, yet left them out entirely on your orthographic plans.

  • There are a couple of places such as the webcam or the mug where you approached the curves of the structure's body with the same kind of general estimation/eyeballing that we want to avoid. This section from the notes explains that we do not want to jump straight to a curve without first laying down some kind of structure that will directly support it - like a chain of straight edges or flat planes.

  • Onto the last point, there's examples of form shading throughout your constructions. When it comes to filling areas of black, it's best to reserve those for textured surfaces or cast shadows only.

Again, as a whole you've done a great job with your constructions. These points are fairly minor but I think taking them into consideration will help push your constructions even further. Feel free to move onto the 25 wheel challenge.