I have trouble describing settings or ideas in an interesting way in my narration. Dialogue? Sure, that's easy for me. I'm always imagining my characters talking to one another. But I hardly ever think about where they are, what the place looks like, and if I have any important things to explain about a setting I can't do it too well without sounding like a brochure. Now I could probably tell you where all the characters are in relation to one another, what they're doing, how they're doing it, what's on their mind while doing it, blah blah blah. Anything character-focused is extremely easy for me, but I don't exactly have a vivid picture of what everyone and everything looks like. So I'd say a good 70-80% of my novel is dialogue lol. It's just "This is where they are" then they talk. I'm working on it tho!! It's hard, but I'm working!! Just appeal to the five senses and use the proper words to convey tone and atmosphere.
Also, it's kinda funny, but I have pretty much the same exact problem with my comic as well... Characters are detailed, full of personality, and whatever else they need. I'll draw every single character in a scene no problem. The backgrounds? Either way too simple and doesn't give enough information, or straight up non-existent. Again, a problem I'm working on and I think I'm starting to get a good feel for it now.
So uhhhh, yeah. I know I'm not perfect, but I'm trying my best lol