Per my tattoo artist, it depends on the thickness of the dermis, how well you adhere to post-tattoo healing instructions, your general lifestyle choices regarding friction in that region, and sun/chemical exposure. And probably other factors I'm forgetting.

So...it varies a LOT.

He recommended strongly against super fine lines in general; anticipate the image of the tattoo will blur just a bit and consider of that slightly blurred state will still look good. One of his clients got a wedding band tattoo of a stag head - intricate antler pattern, whole 9 - advised against it, client wanted to go for it anyway so he agreed. Couple years later that dude was all over his social media bitching about how terrible of an artist he is for his now-blurry-as-fuck stag head tattoo lol.

Now he just won't do that type of art, cuz even if he warns people, they'll still come later with torches and pitchforks when the thing he said will happen happens.

I'd think the dermis below the calf is at least a bit thicker than the dorsal aspect of your fingers, so based solely on the ring finger cautionary take, I'd guess the tattoo shown in the OP would look crisp for a year or two, then start looking like it's increasingly out of focus.