Pixel art is art. To be good at pixel art requires the same skills as art: composition, color, lights and shadow, shapes.
While there’s no shortcut, I would suggest that in games, consistency in art style is way more important than quality. If you can make your graphic style consistent, although maybe very simple and not so aesthetic, it will make the game appealing.
I think IMO art is about conveying human ideas/emotions that’s beyond words. So it’s more about what the artist intentionally or unintentionally brought into the piece. With AI “art”, it’s just filling noise into the original prompt. In that case, why don’t you just show me the prompt instead of the noisy lossy “art” piece?
This is like the best C++ tutorial that covers all those niche corner edge cases that I had to learn from a hundred different Even More Effective C++ books
To my knowledge, sadly I can't find an English version of it. I'm too wishing for a future English version so that I can read it. But I guess it will be a lot of work to translate it into English.
While there’s no shortcut, I would suggest that in games, consistency in art style is way more important than quality. If you can make your graphic style consistent, although maybe very simple and not so aesthetic, it will make the game appealing.