“I, and some of my classmates, have been dealing with the issue of how much drawing one should do on the surface of a canvas (board, panel, paper etc) before jumping into paint. This is outside of the studies that are done beforehand and assumes that a drawing is not being transferred. Basically we've bumped into the issue of doing relatively tight, refined lay-ins in pencil and then completely losing those delicate drawings once paint is applied. Some of the teachers and students believe in "finding" the drawing with paint rather than doing a tight charcoal/graphite underdrawing. This could be related to the fact that most of our teachers here seem to advocate the thicker paint application of a certain style of Alla Prima, but I'm not sure.”
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Dear Stephen:
I practice and recommend both extremes, depending on the picture. When I'm painting outdoors on location or doing a portrait from life, I completely find the subject with the brush (no pencil drawing at all), beginning with spots, big divisions, and measurements.


With a very complex subject, like a sinking Civil War sailing ship, there's no other way I can imagine approaching it.

With an imaginary scene with a lot of figures, historical elements, mechanical forms, lettering, or anything of that kind, I recommend following something like Rockwell's method of the separate full size charcoal comprehensive, or "cartoon" as they used to call it. Of course that practice in one form or another goes back to many of the old masters.
The charcoal comprehensive pays dividends because you're not trying to solve basic problems with paint. It’s much easier to do either a line drawing or a full-on tonal study as Lovell tended to do. On top of that, it really helps to do small tonal studies and color studies.
Once you've worked out your picture you can be confident of the painting. If the drawing is "saved" in a separate tracing, you should paint boldly with no fear of covering up lines. You can always find them again if you need to.
It should be said that there are others who got great results with complex multi-figure scenes without always doing the comprehensive preliminary drawing. They bravely “found it” in the paint, and the painting shows the fascinating struggles.

I’ve also seen demos by Richard Estes and Frank McCarthy, which show a ‘find-it-in-the-paint’ approach on at least some paintings.
You can figure out these methods by looking at half-finished paintings, in strokes of overpainted elements or pentimenti that have transparentized, or in the edges of the picture normally hidden by frames.
Waterhouse from “I am a Child” website.
More about the charcoal comprehensive and preliminary drawings in my book Imaginative Realism.