A bit of experimenting revealed that the Specular on this shader is really really low.

So I opened up the Blinn node, which is where the specular is being made. I insert a Math Function:Add with Value_2 connected to my tattoo mask. Then I kept increasing the Value_2 until at 10 it looked like I had a lot more specular, BUT ONLY ON THE TATTOO.

This lets you make the tattoo shinier than the skin, as you like. In this case, the tattoo is 11 times shinier (1 + 10) than the skin.

I also found that the Bump amount on this shader was really low - perhaps too low. I raised it to .04 instead of .02. This made the skin bumples much more visible. You would have to do this to all skin zones to match. Or, you could do math functions to only increase the bump over the tattoo. If you want to see that, ask.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)