I agree with what EnglishBob said. You can make a quick bump map by taking a texture and just turning it grayscale, but some things will be wrong... especially where things like eyebrows or body hair is involved. For instance, if you turn a texture map grayscale, the eyebrows usually translate to dark gray or black, which would mean their details render "concave" instead of "convex". To fix this in photoshop can be a bit tricky, but the basic notion is to mask out the eyebrows and then simply invert them (change them from black to white), or paint them over in white by hand using a very small brush size. Same goes for facial hair or body hair that may be present on the texture. Also, details like veins may need to be lightened so that they render as raised parts on the mesh surface, rather than depressed. In contrast, wrinkles should be darker in the grayscale than the skin color.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.