One helpful resource is https://www.refactoringui.com/ https://www.refactoringui.com/ and related materials/blogs - but evaluate it against your inspirations to

One helpful resource is https://www.refactoringui.com/ https://www.refactoringui.com/ and related materials/blogs - but evaluate it against your inspirations to understand when the “rules” should be broken, or aren’t even rules that apply to the aesthetic you’re going for! Particularly if that aesthetic is advised by, say, luxury fashion. But it helps to understand the space of what is possible!