The texture of a model has nothing to do with the polycount. A low poly figure can have the same texture template as a high poly one, thus it can use the same texture. As long as you use texture map, you are bound with the resolution of that map. V3 and PosetteV3 could use the same material, so the texture would look the same even on extreme closeups. If you magnify too far, you will be able to see edges on the outline on Posette, when the scale becomes to large for her low poly mesh - but if you use smoothing, this will take a while.

In theory, high poly figures bend better, but this depends on the rig as well. More polys is also better for morphing. But Posette is already very versatile.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.