The sphere. I've done a few of these in the last days. It's harder than it looks, and then it's actually quite hard to take a picture of it without getting reflections that makes it look unevenly shaded. I think it looks al right but the shape and placement of the "terminator" have strayed a bit off course.
Nicely done, but take look at the cast shadow on the tabletop. Draw a line from the right edge of the cast shadow tangent ot the sphere. Do the same on the left side. Those two lines should be parallel, at least if there is a single light source. You are right, it is not easy!
Thank you for that! And right you are about the cast shadow. Loomis has some very very good descriptions of this in some of his books that I've read after posting this first one. I haven't put the perspective system he explains into action yet, but I think I am just about am starting to get it. I've done maybe 6 or 10 more spheres this last week, no really long ones though but I would say they are better than this one. Nailing the shape and placement of the terminator is the biggest challenge. I also did one sphere with a smaller spehere inside the cast shadow of the big one.