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Photoshop (or in my case, GIMP) is something of a Time Goblin. There are a ton of filters and tools, all of which have many sliders you can move around all day to see what happens to your many layers. I concluded at some point that it's best to avoid going into it as much as possible.
That said, it's rewarding to just indulge in it once in a while. Here is a thing I made to illustrate the Mayor of Cats from the D&D campaign I'm running.