i also got a negative and opposite trace of the tattoo from my right elbow done on my left elbow:
the rest of the background for this sleeve is going to be dark blue and cloudy/gaseous like the grey fill on the right sleeve, but i had it more "solidified" here to make the negative effect stand out more. here's the arm zoomed out a bit:
here are both elbows side by side:
and then ^^that image^^ flipped for perspective, since gridkid1 was having a bit of trouble fitting both elbows in the frame from any other angle while she was taking these for me