Hi Adam,
perhaps this would be possible to do.
First double the size of the texture image to get a 4096x4096 resolution and then rework the skin so that it gets sharp again and that the details get clearer. Perhapa add some more details.
But it sounds like much work and should perhaps better be done by some experienced skin modder.
My photoshop/gimp knowledge is yet limited to little signature works and such stuff
