Mounted minis would be great, maybe some Aquilonian Knights and Hyrkanian Horse Archers.
I'd love to see a Manotaur (from a Marvel comic)
A Child of Set (from The God in the Bowl) would be amazing!
I painted my first Giant Snake like Satha, but an actual Satha would be great.
Also Tsotha-Lanti, Nabonidus (with some traps/tricks), Some Kushites and some Darfari cannibals, a Crawler in the Dark, Nestor
Juma if we are going pastiche, and movie Valeria (Hell, Movie Thulsa Doom)
Amalric and Lissa from the Drums of Tombalku fragment.
The demon from the Snout in the Dark fragment.
Captain Bor'Aqh Sharaq if we are going really pastiche.
Forest Ghouls.