As an artist (by training. I don't really do that much, these days), I can relate.
I used to have a big Strathmore sketchbook, that I took with me, everywhere, and, whenever I had the time, I would practice in it. I have old photos of me, with it. I was fairly scruffy-looking [still are -Ed.], and the sketchbook was sort of my "brand." My classmates used to call me "Puff," because I liked drawing dragons.
It got to the point, where even my rough sketches would be as good as finished works.
The same goes with my code. For example, when I start writing code, I habitually add a headerdoc comment, almost immediately. I write about that here: https://littlegreenviper.com/miscellany/leaving-a-legacy/
I work surprisingly quickly. I can generally spin up a full-fat native swift app, App Store-ready, in a couple of days. I do that frequently for my test harnesses (but I prefer taking more time, for the apps I actually plan to release).
I never really warmed to Boris Valleho's work (he used to hang in a gallery that I had work in, and I met him), but I have to admit, that guy can draw.
Look up his sketches. He used to make a lot of money, selling them, so there's a lot of them out there. The gallery that I mentioned, had a big rack of his castoffs, selling for hundreds of dollars. They sold like hotcakes. He was that gallery's star (I, on the other hand, was chopped liver).
Here's a few of his marketed drawings, but his sketches are almost as good: https://www.borisjulie.com/product-category/prints/boris-pri...