The Kepler mission is doing pretty well. Recently they have discovered a couple of new planets. Fine. However, I'm pretty sure the only thing we actually know about these planets is that they are probably spherical. The artist conceptions take it a little too far. Why not go all the way?
I have a separate problem with the line-up. At first glance it looks like a bit more than a 3% difference in radius, but the south poles are all lined up for the other planets while Kepler-20f is bumped up a bit. I have no idea why they did this since I thought the similarity to the radius of the Earth was the interesting fact.