First is a Hadrurus sp. photographed under just the right light to make it look more awesome than it really is . . . it's come up before.
Second is a Heterometrsu sp., probably H. spinifer, photographed with a flash that had enough UV in it to make it come out green (same effect as natural sunlight).
Third is Androctonus crassicauda, NOT for a beginner.
When you're starting in the hobby, the absolute worst way to go about picking your first scorpion is choosing the one that looks the prettiest.
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."