It's all in the lighting. try the Global lights sets from Daz with your textures, I think that's what was used for the V3 promo shots of those textures. RuntimeDNA has a lot of free high quality light sets for different moods and looks, they work well with high res photo real textures. When I was playing around with V3 with lights I'd put on or just mucking around the textures never did look as good as the promo shots until I started working with the light sets that I mentioned. I don't know of any high quality photo real textures for free. There are a few for V2 and M2 in the freestuff and if you have the texture converter application you could convert them to V3, or M3.