I've scoured official HoYoverse channels for any Nahida and Aether art, and from what I've seen, there isn't any explicit 'ship' art released by them. HoYoverse tends to keep character interactions ambiguous in official materials to let players imagine their own dynamics. That said, their in-game story scenes together in 'Genshin Impact' are undeniably charming—Nahida's curious, almost childlike wonder plays off Aether's patient traveler vibe so well. The closest thing to official art might be promotional images where they appear alongside other characters during events or archon quests, but nothing romantically coded.
Fan artists have absolutely run wild with the pairing, though! The fandom's creativity fills the gap with everything from sweet, innocent doodles to elaborate, emotionally charged pieces. If you're craving Nahida x Aether content, platforms like Pixiv or Twitter are treasure troves. Just be prepared to fall down a rabbit hole of adorable and sometimes heartbreaking interpretations.