Art: "Iron Man," 2010
Even if you don't recognize Alex Ross' name, you've likely seen his work; his photorealistic renditions of classic comic book characters has been made one of the most well-known and in-demand commercial artists of our time, lending his style to not just denizens of the comics industry, but to musicians, video games, feature films and more.
The above image of Marvel's Iron Man was created for a limited run of 250 prints as part of a series called "Alex Ross Visions." You can stay up-to-date and browse Ross' artwork at his official site, though if you're looking to buy, you'd better have a sizeable chunk of change at the ready.