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I construct all my drawings, I try to use simple forms. Sometimes I start light and faint so that the end result is clean.
Right now I'm at my parents' house where they have a non-professional scanner, It doesn't pick up what my Epson easily does.
Here I made the construction darker to be somewhat visible, It's a bit more visible with the contrast bumped up in Photoshop, Especially the hand.
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About the process: I think It's important to draw on a slanted surface and not a flat surface, A significant change of angle and plane will change the proportions.
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I've been using Photoshop as a study tool to compare my copies to the original, but this time I didn't want to do that. To compare my drawing to the original, I flipped the pages, just like animation paper.
I found it natural to do it that way, each step I would measure, draw and compare/flip, then make corrections/adjustments. Obviously the paper gets creased and crumpled, as seen in this snapshot.
After completion I scanned it into Photoshop, to lay the final result on top of the original:
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I'm happy with the result.