I have to agree with Conniekat8 here.  New tattoos (very new - as in a few days old) look just like they were painted on the skin.  This is due to two reasons: ink still persists in the epidermis and the skin is still 'wounded'.  Skin is replaced over time. Any residual ink in the epidermis will be removed by healing and this process.

But older tattoos are below the skin.  I think that the image at the end of the first page is the best of the lot so far.  Again, depending upon how accurate the representation is to be, it is best to study real tattoos from a variety of sources - a real person would be optimal.  Tattoos are definitely not sharp edged.  They may appear that way in photographs - but there is a bleeding of the ink under the skin.  So maybe a blur node would be called for (seeing that there is none I'm not sure what the analog would be).

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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