I don’t necessarily have headcanons for this stuff, so I’m going off the top of my dome here:
- House Gardener should have the “look” of Garth Greenhand, who my headcanon is less this than this. So, handsome/beautiful in an earthy, slightly louche way (capable of running to fat if they don’t work off the calories from living the good life) that befits the descendants of a fertility god. I also like the idea of them having hair and eyes that are a mix of brown and gold, earth and the divine mixing.
- House Justman should be a mix of the “looks” of Houses Bracken and Blackwood. So the Brackens tend to be beefy but not tall and with brown hair and eyes, and the Blackwoods tend to have black hair, hooked noses, and tend to be goth as hell. So Justmans would probably have dark hair and eyes, a balanced physique (neither as wispy as the Blackwoods nor as blocky as the Brackens), and noses that are a careful balance between the two families.
- House Teague were Andals, who tended to be fair-haired; beyond that, I don’t have any ideas. I like the idea of the Teagues as being short, because I like the idea of them as feisty bantamweights who don’t know when to give up.