Talking about covers, whether visually or sonically, if a particular combination of notes struck a chord in your heart in a way that you want to be a part of it by covering that song, then there's nothing wrong with it. ↗
I am very much aware of the visual side of things. I do a lot of photography. I often take Polaroids of things that strike me as visually interesting, just to remember them and perhaps use later. ↗
What's funny about that is when I was writing Twilight just for myself and not thinking of it as a book, I was not thinking about publishing, and yet at the same time I was casting it in my head. Because when I read books, I see them very visually. ↗