Applying a tattoo across seams

OVD

I started with an idea of having a side-of-the-head tattoo thinking that it wouldn't be that bad to apply just using Photoshop. Boy was I wrong. 

The trouble basically just comes from the warping of the side of the head on the face texture. You can see what I tried to do attached, but as stubborn as I am, it's just not worth it to keep trying that way. 

I know there are projection painting application that can be bought, but I honestly can't afford those. I'm somewhat competent with Blender, but basically my question is: how should I go about trying this next? (And if with Blender, could you link a tutorial please?! I've looked, but none that I found quite cover something like this.) 

Richard Haseltine

It might work, if you are rendering in Iray, to use an Iray Decal Node (from the Create menu) to project inside DS.