For starters most Enigmas don't look anything like a normal. Also just about every enigma that I have seen has some orange tinge to their eyes (not pink or red like an albino). I don't think you can really pick out one thing that makes them stand out from the rest. I know that a lot of them have almost solid white tails and seem to just have random patterns and color. For me it's just one of those things that you can just tell when you see it.
I think you should start by looking at LOTS of pictures. You'll start to pick out traits. Orange eyes, horseshoe shape on the head, clean(ish) tails, pepper markings that can be mixed with bold markings, and the color has a unique way of "bleeding" into other areas.
that answered for me i saw everything you guys say. i had just seen one that didnt look enigma but was called enigma i just cant find it to show. but thank you for the responses