Here is a painting midway in its progression. I add a new layer to the painting based on instructions received in my painting class each week. This week the instruction was to add blended objects.

 This week the instruction was to add "calligraphy marks" with an unfamiliar utensil...in this case lines from a squeeze bottle.

 This week the instruction was to selectively cover/uncover using opacity.

This week the instruction was to develop an "expressive" layer using watered down house paints and a large paint brush (2 inch).