Easiest way to pick out a pastel is, they have green eyes.
I've seen some pretty poor pastels, and some pretty amazing normals. But pastels have green eyes and normals do not. Normals usually have eyes that are a shade of brown or gold.
I'd say 90% of pastels I have seen have eyes like a cat, I mean really green. A few have green/gold eyes, but you can still tell the difference.
Gale