Click to enlarge (BIG)

Look at this example where I used this technique to put a corset on V4.
But the same thing works for a tattoo.

The corset/tattoo is in Image_Map_9.
The corset is colored and the background is true White.

This goes to math_Functions_2 to make a inverted B&W map that I used in Bump and Displacement.

It also goes to the Blender_2 to get mixed with the origional figures skin map.
The Blending is controlled by Math_Functions_3
All that is BLACK on this map will get the origional figure skin.
All that is NOT BLACK will get the corset color.

From Alt_Specular, I go to a Blinn_2 to get the corset to shine. Reflectivity again controlled by the Math_Functions_3 node

Study the screengrab, and you can clearly see what every node does.

PS; This is an older setup.
The texture filtering should be set at Crisp for PP2012.

in short.
The Blender puts the corset on the figure skin controlled by the math-Functions_2 node.

Or the tattoo in your case.

Happy Posering
Tony

PS; The corsets have different colors because you can play with the Input_2 color in the Blender :-) :-) :-)

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!