Some people can get very vivid mental images though, with lots of details. If you think it’s hard to describe if you can’t do it, then maybe you’re actually in the same or similar boat as me. I never realised I can’t actually get “mental images” because I assumed whatever pops up in my head is what people were talking about. Just thought it was what people ended up calling the mental concepts, didn’t consider that most people can probably actually “see” mental images to some degree.

And no, I wouldn’t say I can imagine tastes or smells but I can imagine sounds somewhat.

Edit: when I say “see” I mean having an image pop up in your head, like you mentioned in an earlier comment. I don’t get images popping up. I get concepts of something, with kinda attribute labels attached to it. I know a rainbow is a curved shape with the spectrum of visual colours and so on but I don’t get an image of one in my head. I just remember stuff about it.