It should be picturesque. What, you don’t think illness is picturesque?
Soooo the illness has to be ... somewhat conventionally intriquing and vivid? Why is that? So people aren't disturbed by what other illnesses bring? But talking about these "non-picturesque" illnesses would shed light on them, bring awareness, and honestly just make a unique and vivid subject to write about. I don't really agree with the author's point here. Some subjects are hard to tackle but should be talked about nonetheless. If you're a skilled author you should be able to unearth some kind of odd, sublime quality to writing about such a thing anyway.
