That's probably one of the two best representation of a Gate, imho yours and the one illustrating Steve Mohan's short story Infinite Horizon. My first mental image of the Gates came from Morgan's description of the artifact in Broken Angels, and your depiction of it fits it to a T (with two sugars and a cloud of milk,please )
Awesome I think the illustration you're talking about for Infinite Horizon was done by Richard Anderson, or Flaptraps. He is the cinematic concept artist on Guild Wars 2, he has some really beautiful stuff.
one of the reason why I love Terra Nova so much is because the similarities with Eclipse Phase and the Gatecrashing angle. I mean, look at the scene when the Shannons are about to get through the portal. To me, it perfect illustration on how the Gate Keeper hypercorps facility on Mars must look like. That would be interesting to see artists' vision of each of the system's Gate rooms. especially the ones on Chat Noir (held by the Autonomist and Anarchist) and Eris (held by the Ultimates). Must be very different in styles