What brands or individual artists do you like best who make heads for 75cm dolls (specifically ones that are sold separately from the body)? So far the only ones I've seen are Granado. I've got off-topic bodies that need some big heads, so suggestions are appreciated!
I would check out dealers like MyDollection, Jane's Dolland, and Moonlight BJD House. They carry a lot of indie sculptors that just make heads/make mostly heads and the 75cm size is very popular. Just make sure the neck circumference matches the body you have and you should be fine.
Telesthesia sells heads separately from the bodies and the sculpting is really nice. 2d Doll also has some 75+cm boys, and I think I've seen the heads sold separately. Depending on the measurements of the bodies you have, some Switch heads might fit too. a lot of companies and indie sculptors are working more on dolls in that size range, so there's probably a lot more out there!
I’m a big fan of R.Dean heads. Especially n.Rei. This head even made me break my rule and get doll bigger than 25cm. Lately there is so much nice big heads. You can check newcloversinging site. From time to time there is new big heads.