Here's my take. Of coarse the textures are distributed at high res like that for close and far renders alike. You can get right up on her eyeball and the skin around it will look sharp and clear. Now if you plan to do renders, much smaller than that all of the time, and you notice your computer going much faster with smaller textures then by all means do it. Open up a 2d Program. Open the Textures and Bump maps and reduce the image size by half or even more than half. If it's at 3000x1500 for the face, you could go 1500x1250 or even 1000px on the width. Try the save for web if you have it and keep it high, 80% or higher. Compression of jpeg helps but it uncompresses when it's used so your pixels will make the most difference. Keep your zip handy or make 2 folders for textures. Go into your runtime/textures folder and just rename your lo texture folder the same name and the hi-res folder, you could delete and re-install it later or just rename it for now. All the pathways in the mat files will still point to the lo res files of the same name. And you really won't notice a difference in render quality. I guarantee it.