Re my 'coloring' - I use colored pencils in my work - CAD Drawings, and normally just need Red and Yellow. When I complete drawing something I color in (shade) the Arch's Blueprint with Red or Yellow so I know I'm done with 'it', and also to track a 'System' through a building.
But I recently had a complicated project with one System that had 21 'sub-sections', so I needed more colored pencils and had to get a box of Crayola's.
In Professional Drafting (Architectural & Mechanical) the 'coloring' (shading) we did to a Paper & Pencil Drawing has some fancy French word that I can't spell, it's pronounced -- 'Pooh-shay-ing'.So when I saw one of the outlined pics, I thought, 'Hey I'll 'Pooh-shay' this' with my colored pencils and see how it looks :-)
that sounds like an interesting career, but way beyond my understanding. Blessings to you and your family this week.