Well they're two very different games in my opinion with different worlds. I agree the basics are there but Fire Emblem and Zelda have a complete different physique when it comes to character design.
FE is more flashy and Dungeons and Dragons-ish (Obviously) with Japanese Character Tropes to balance off very Western Iconography.
This picture of her mostly reminds me of Aversa from Awakening:
fireemblem.wikia.com/wiki/File…Whereas Zelda I feel has always been a bit more unique in character design. Because although it is a high fantasy story, it focuses less on the Dragons and Stuff, and instead focuses more on its own Lore which I like.
Both are good, but both come off as different. So I still think Cia's and Lana's design looks out of place. I think if they stuck with something that felt a bit more authentic to the Zelda Series it would have been fine.