Unless you're accomplished at Photoshop.
Over at Fugly Horse of the Day there's been an ongoing discussion of the ridiculous pictures people put up on the web to advertise their horses. (Hint: Don't make your breeding stallion look mangy, poorly conformed or bad tempered. Bad advertising. Also, don't put together a website of your breeding operation with unicorns, wispy clouds, and fairies in the background.)
One of the commentators on FHOTD put up a demonstration of her photoshop skills. Yes, there are "tells" all over the pictures, and she points out what they are, but hey, I'm impressed with the conversation/demonstration nonetheless. Here's her page. And here are the before and after photos. Woah. Check out her page for the rollover comparison.
Makes this older picture of my dear old friend, shot in the days before the web and Photoshop took over horse advertising, all the more impressive. He was about 19 years old in this one. What a good boy.