Also try to have a budget in mind! Like the great Leon Wit said above, art is a luxury good, and as such can be pretty expensive. But (usually) higher prices = great art and service!
But beware of great artists who do awesome art but terrible service, always look into their customer reviews or ask around. Some very famous popufurs are terrible at managing time and often leave clients hanging for literal months.
If you don't mind NSFW examples, please check out my FA page, there you'll find my work and commission info! :3