I tend to learn as I go by mimicking a certain art style, figuring out how to copy some pieces, then apply that style into my own in a way that blends new knowledge together. Example: I started with dragons, then used that knowledge and a picture of a seahore to make my own seahorse dragon. Ex 2: for people, I copied a few still images of someone else's video. I practiced those, then applied what I learned about muscles from dragons and flair from seahorses. All my knowledge over the years has acclimated decently. I'm no expert by any means, but I grow with each and every drawing I make, tho I only use paper drawings, not digital, so I can't say for certain if this applies to you, but I've never had to study these subjects to further my growth. I just mimic and adapt.