Zoungy asks: "What's the term for painting each area to completion, rather than painting the whole area broadly with pale washes and increasing the depth?"
Answer: "Some people call it "window shading," especially oil painters. I usually call it "area-by-area painting" when it's in oil and "ink-jetting" when it's in watercolor.
For example, I want to paint this diner in watercolor. I start with a pencil drawing to give a baseline scaffolding. While I'm doing that step I notice that a couple of the cars have already been replaced by new cars.
It has an active parking lot. Patrons stay inside for an average of 45 minutes (according to Google). I decide to paint the motorcycles first and then record the parked cars one at a time.
The rendering grows outward from those finished areas. I can worry about the sign and the trees after I finish the parking area.
Ink-jetting is just another painting strategy that every painter should try and have ready when you need it, in contrast to the "overall approach" advised by Pissarro and others.
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Previously:
Area by Area Painting
Window-Shading
Pissarro's Advice to an Art Student