Doesn't Poser read .psd files? I believe it does for backgrounds ... haven't tried them in the Materials Room yet. It's true that you can add tattoo images to existing mesh textures in Poser, but alignment can be quite tricky. Unless you want to apply the tattoo across a challenging seam, it'd probably be easier to edit the .psd file in Photoshop for correct size, then add it as a layer to a Poser figure texture. Blend "to taste," probably at about 90% or so. Remember that tattoos aren't opaque decals slapped on top of skin. A tiny bit of blur may also enhance realism.