3-Fold question about L.I.E. placing a custom Tattoo and SSS

OK, here goes.
I have a character that i want to give a custom tattoo with a bit of a cyber theme. I found an image i liked from a game. Opened up photoshop and mate it into a transparent png.
I used the L.I.E. to place it on my arm and as you see in image 1 and 2 it turned out pretty good. The angle allignment is slightly off but not in a disturbing way so i may end up messing it up more. (hard determining the angle by guessing)
In image 3 you see the result. It does not look black.
After some fiddeling i noticed 2 things: image 4, when i change the SSS Colour to white the tattoo is black but the skin looks bad.
Simple question was or rather is how do i fix this.
Then i noticed a second thing. I also have the bellatrix tattoo D on that one looks fine. So played the "look for differences" game and i noticed that in the L.I.E. the layer of teh arm skin has a mask.
Now something tells me that this does something to override or correct what happens in image 4 (and therefore in 3).
Is this correct? and if so. How do i make such mask and apply it.
Thanks in advance
EDIT : i tried to duplicate the belatrix tattoo settings but i am probably doing something wrong. as it is still not working.








Comments
Thanks i will give that a try tonight.
I saw the bellatrix tattoo was added there as well. And after putting my tattoo there as well. It was black!
Thanks a lot!!