Suicide prevention is INFP? Ted Bundy was probably xSFJ. And my ESFJ ex would probably fit your ISFP "art show." So would an ISTJ I know.
You have to factor for functions. Like the Fi heavy ISTJ who seems like a very "creative" or "sensitive" ISFJ.
Or the ESFJ who has had the same list of horror movies since he was eight, checking them off as he goes from a page ripped out of Fangoria Magazine held on to dearly for like 15-20 years. You can't say this emotional terrorist "you're so moody" is an Se or Fi type.
I've seen people talk about ISFPs who looked more like ESFPs, or who just looked like they were passive/stoned beyond reason.
I honestly think you're going to have a hard time spotting SJs, frankly.