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I did a bunch of thumbnails in preparation, first to decide what images I wanted to make - here are some that didn't make it:
For the first one, I did the preliminary pencil sketch right on the panel, then went over it in India ink for the grisaille underpainting:
Doing the first one brought home to me that for egg tempera, you really want to nail down the layout and values pretty well before painting - the medium isn't conducive to major surgery later on. So I did more thumbnails and a full size sketch for the second one.