It took me a while to get to this exercise so I did a couple of extra views. I thought the airplane would be fun to do, but the top view became more of a rendering exercise because of its flat silhouette. Anyway - it was tempting to add half tone to the plane sketches to bring out some form, but I pulled back (even erased) in hopes of concentrating on AO.
I did the simple ao assignment in graphite, on computer-print out paper. I assumed there was a lot of ambient light, thereby making the shading and shadow very subtle. I actually broadened the occlusion shadow in this, my 2nd version. (I didn't spread the shadow beyond the circumference of the objects in my first draft). The paper got a bit crinkly when I did this. I had trouble imagining a shadow around the base of the cube, considering light would be flowing all around the object and it was flush with the surface plane.
I did the exercise in photoshop with a mouse, not a stylus. I found the lesson more challenging than I thought it would be, due to the complex shape of the monkey’s head and so I spent a lot of time with it. I made several changes as I went through it. In particular, I kept changing the shadow under the monkey’s brow, —from form shadow initially, to cast shadow, but settled on dark halftone; the reason being it was in the light family. Another thought was whether to include the ear on the right as a form shadow or cast shadow, or both. I also had some thinking to do about the center light. Because of the modeled surface there were some parts that seemed to be receiving center light, like the monkey’s eye on the right, even though it was surrounded by half-tone. And I wasn’t sure how broad to define the ambient occlusion. So I would really appreciate some feedback on this assignment.