The image on the left is a night scene with the desk lamp as the main light source and a little bit of moonlight coming through a window on the right side causing the rim light. The image on the right is a daylight scene. The main light is coming through the window on the right side.
The second demo was the image on the bottom left. This demo also included how I organize my layers when I paint at work to be able to address changes quickly.
I painted the scene on the right side beforehand to show how lighting can be changed easily.
SJSU people thanks for the warm welcome and being such a great audience. I had a lot of fun presenting! I hope I could inspire some of you guys to do daily speed paintings and to set some "unreachable" goals :D
This is the thread of the sijun forum I used to post at back in the days.