Those textures from the link still have burnt in specular. As far as "real" bump maps... what exactly would that be if not a desaturated, tweaked and level adjusted version of the diffuse texture. I like procedural bump myself but that doesn't account for high frequency detail in the color map. A combination of baked out procedural overlayed with gross high frequency detail displacements (moles, large pores, etc) would probably be the best "real bump" solution. Specular is difficult to eliminate in photo derived bump.

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