Looks like one of those %%$## tattoo "tribals". Not a fan, but I am guessing it is a custom decal. You might try writing to Ford's advertising agency with lots of sucking up you might get someone in the art / graphics dept who could help. Or watch "Madmen" diligently. Good luck, seriously.
2011 GT Premium Brembo ("Spirit"), Kona/red, 1.5" drop, Goodridge SS brake lines, 3.73's, LPW Ultra diff cover, HID, JLT oil catch can, FRPP ProCal II w. Airaid, FRPP X-pipe, Roush axlebacks, Boss LS tranny cooler, Boss oil cooler, Boss radiator, Torsen T2-R; FRPP "K" springs, struts, shocks, mounts, anti-rollbars, upper strut brace, poly bushings; Barton shifter/MkII bracket, CG-Lock, Grabber knob, silver Forgestar CF5 19x9 35mm offset, AE aluminum driveshaft