If you don't mind me weighing in on the matter i think if you want the three percenter with your existing tat, I'd personally go for it in a light blue/ shaded cyan and accentuate the snake with some colouring and shading, then move up the arm and at the top have your tattered flag so that it covers your shoulder and drapes onto your arm, i like the design so far and i think that with the emblem, it would probably look best around the ditch/ outside of the elbow and then background it with your further ideas. That IMO would probably work best.