It's by ciderpress and I think this is a really cool Sheppard piece, it's from a Mensa AU verse, but I like to look at it of the duality of of John. Either way, it's really awesome.
This is a preview.
But you can go over “here” to see the full image.
She also has some of the coolest and creative icons. I love the level of detail in them, not just cropping and coloring, but just the bits of flare. Here are all 'her SGA icons tags'.