You know who John Picacio is, right? If you've been paying any attention at all to cover art for the last five years, you've seen his work. Picacio has a very distinctive style and it is often easy to recognize a Picacio cover. He has twice won the Hugo Award for Best Professional Artist, has won a World Fantasy Award, a Chesley, and I'm pretty sure he's been nominated for everything an artist can be nominated for. If he hasn't, I expect he will be very soon.
I'm a big fan of the "La Luna" piece. Beautiful and striking. Also, "The Good Life."