With my past modded-playthrough [currently I'm running an 80% vanilla texture PT particularly with Tatooine's decorations], I have been using the fan favorite's- multiple's "Old Republic Skin Overhaul - Tatooine v1.0" for both the interior and the exterior of this [the way I see it] amazing planet.
Apologize that for now I can't provide an actual in-game screenshots from my end, as I don't have the mod installed currently but I have some which I have grabbed from the host:
Images are hosted here
For the skyboxes; I can't think of anything more fitting than Kexikus's "High Quality Skyboxes". Pure sheer quality
For content related stuff you just can't miss VarsityPuppet's "Helena Shan Improvement", or you'll just ends-up mistaken her with another lady in the bar
I think that's all I can think of regarding Tatooine's essential contents for now. 🤔
Hoping more references are coming your way!
Edit: I'll let you know with an update if I manage to found some other stuffs on the way.