The lens is zoomed in, the texture is too blurry
does anyone know how to set it up?
the texture size is 4096*4096
If a texture is 4096*4096 for an entire human body, then, yes, zooming in on the thumb, will not cover it particularly well. That’ll only give you approximately one texel per millimeter coverage, which is pretty coarse. You’ll need at least one texel per one-tenth of a millimeter for the shot you’re showing.
If the texture is 4096*4096 and is supposed to only cover the hands, then you should be able to get better coverage than that.