On to spheres

I'm working on spheres now.  They are harder than cylinders, since the shading needs to be just so.  Here are a couple of my more successful efforts:

This one looks oddly lumpy.

I need to extend the shading, I think.

I'm going to keep working on this until I get it right.

Now in 3D!

So the next lesson involves placing shadows and shade so that a form looks like it has dimensionality.  I did a couple of other "practice runs", but this is the one that came out the best:

Blue Pencil Holder

I'm still not sure of my shading -- I'll clearly have to practice a bit, but this looks much more dimensional than what I have been doing

Creating different shades: Yellow

The next exercise was to take a color and create darker shades of it, first using black, then using its complement.  I did this with red, blue and yellow, but the only two in this post are the two I did with yellow.  I may post the other four later.

Darkened with black

Darkened with purple