First draw a golden spiral that resembles gold, later add it some purple colors before shading it. This spiral symbolizes the end illagers,like SpellmakerTheHybrid said. This is necessary to add illager fidelity to the mob. If you want like " Corrupted End Allay who don{t accept illagers" put the symbol like erased but the gold colors need to be low visible but at least distinguishable. If you make end skins with illager parts draw illager eyes and eyebrows, if you post to the Illager Clan i recommend doing end fists. If you texture endermites use HD to complete the details.