Back Tattoos

I took the tattoo drawings and tried to incorporate them into the back in a way that made it instantly clear that the tattoos will be filled in.

I added a 'border' around the area where the back tattoo would branch, giving a sense of a 'goal' for the player to achieve by filling the empty area. I also tried to illustrate the difference between the different branches of skills and finally a back with the tattoos complete.