Semi-Realism Study

I say "semi-realism" bc A)I have no desire to render like Rembrandt, and B)I couldn't possibly do that IF I wanted to, are you crazy...!

 Notes:
Basically there are five things to pay attention to when shading semi-realistically in B+W: 
1)Your base color
2)The Terminator--the point demarcating where the lights end and the shadows begin. 
3)The Core Shadow--the darkest value and the value that, only with occlusion, carries the sense of depth. 
4)The Bounce Light--Take the color of wherever light is bouncing from, in this case a white table, identical to the h'white ball, dial it up juuust a smidge on the B+W spectrum, and, yeah: airbrush or swipe it in. 
5)The Highlight--By far the sexiest value. 

 Oh, there's also the penumbra, but, come on: it's common sense to fuzz the edge of the shadow the farther it is from the object casting it. That doesn't need a name! Anymore than Core Light needs a name! It's obvious that, wherever the highlight is, it's going to ratchet up the lighting immediately around it. (Usually that happens as a matter of course when doing highlights digitally, if you use a soft brush for the general area of the highlight and a hard brush for the hottest point. Highlights are based on light--what part of the subject is most exposed to the light in a given direction--and light is HEAT.