Whoah...I just read this post again and realized I haven't criticized the art yet. Less I faul to provide usefull feedback, here we go...
I like the placement of ships, good way to show scale. It might be able to use a couple more ships though, just so it looks more like a fleet.
The engine glows are OK, a little spherical maybe but about the right brightness and hue. One problem: The Sathanas has the gun-engine glows, but the Gigas doesn't. Is that intentional?
The haze effect is a little wierd in places- it looks pretty good on the Gigas, but somehow the Sathanas is less shrouded at the back than at the front, even though it's tilted towards the camera.
I personally don't like the nebula colors, but the effect is fairly well done. It could stand to be a little more turbulent, and possibly more red-orange than purple-red. Fires of hell, right?

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