Eh, I don't really like it. It doesn't look typically "post apocalyptic", just Zelda with some different art. Nothing struck me as "post apocalyptic" except for the cover art. Which even then kinda fell flat for me when Link's "shield" is a riot shield for the "Hyrule Police". Because apparently they can develop a police force and riot gear but fuck guns.
Plus their faces are kinda odd. Not because they're not "kawaii anime faces" but they're just odd. Zelda's also got a mean case of man face.
Just because he doesn't have a hard to maintain, hard to keep stocked gun, doesn't mean they don't exist.
I know Fallout has bullets in every single container, desk, drawer, safe, etc, but that's not actually how things would work. A sword (or any melee weapon, really) is more realistic in a post apocalyptic scenario, unless it takes place in the US where you literally WOULD find bullets everywhere to use.
Even putting that aside, guns are also pretty...fragile...in reality. They do require some TLC after a while of use, which is another thing you'd have fun finding in a post-apocalyptic world. He'd have to pick up a new gun pretty often, which would likely already be halfway to disrepair, and he'd need different bullets for it most likely.
Though, yeah, I do think his "Sword" and shield are a little too shabby in the pictures.
aaand finally, I do agree with Zelda lacking some femininity. I'm sure she's gotta be all tough and tomboyish to survive, but her face needs some work.