Brand new tattoo's tend to have the 'on skin' look, and the ones that have healed up look like they sunk in a bit.

For the healed tattoo In photoshop, I would probably try to sandwich the tattoo image between two skin layers, the top one being rather transparent, and play with some more blending, blurring and transparency options.

You may be able to do similar in Poser using shader nodes, and blend them at different intensities, little diffusion, little bit of a bump coming from both, the skin and the tatoo (for the fresh tatto look)

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