Ok, it's getting too much:
People, leopards and cheetahs are quite different animals!
So here a little cheatsheet:
First of all, and the most distinguishing: Face markings. If a cat has tearstripes, you face a cheetah and not a leopard. If it has none, it is a leopard. There are no leopards with tearstripes.
Second, less distinguishing: fur pattern. Cheetahs have commonly solid black dots, leopards have brown dots with a dark brown core, so called 'flowers'.
Third, uncommon fur: there are no fully-black cheetahs, only leopards with a melanistic defect. Cheetahs with the same defect picture the socalled king-cheetah pattern, in which the black dots on the back turn into stripes along the back.
#1 Face Visible?
yes: see #2
no: see #3
#2 Tearstripes?
yes: Cheetah.
no: Leopard
#3 Fur pattern:
solid black: Leopard
2-colored flowers: Leopard
mono coloted dots: Cheetah
mono colored stripes along back: Cheetah
mono colored stripes acros the back: Tiger ;)
Updated by Swiftkill