You guys are full of help. Really appreciate it!

These are interesting:
Some demonstrate where the strongest or dominant light source is coming from based on the direction of the shadows.
I thought it is interesting in these photos, not drawings, that there can be multiple light sources with possibly one being dominant. Shiny objects will reflect the slightest bit of light from all sides. Fascinating.

https://www.google.com/search?q=glas...w=1600&bih=769