Amazing piece of work, but I believe there's a little error in the shadows. Either the ISD is in low Orbit, and even bigger than it's already are (and star-destroyers are already ridiculously big), or it does not drop a shadow on the mountains (what's the intended size, I guess).. this could be fixed by slightly lighting the bottom of the craft, since the light comes in from a very steep angle.



Also dropping a shadow/reflection on the water surface would be great (not that anyone would actually take notice, but it would eliminate that 'something's not right' feeling, the image triggers in me) and would make the craft (and it's size) much more 'believable' and therefore contributing to the overall effect of the image.



Anyway.. the landscape looks pretty nice, the atmospheric and the cloud effects are really neatly done. (ignoring the little mistake at the ISDs tail) Personally I don't like that huge moon, but in Starwars' verse, this should be ok - it looks nice and crisp, the light is ok, maybe a light blue atmosphere - aura would add to the overall experience.



I'm not going into detail of the ship itself, since it's a stock.



Having no experience with Terragen2 (and their kind, like bryce and co), I probably can't give much advice. (since I do everything I use directly in blender), but achieving reflection could be easily achieved via post processing.



First, calculating the reflection is not necessary, if you aren't doing a video. Just lay a copy of the ship over the water, mirrored upside down, and use some eraser-magic to thin it out, till only edges and windows can be seen in the water.



From the suspected point of view you would not even have to distort the reflection... it should mirror pretty much the same. Dropping a Shadow could be achieved similarly, but your 3D program should be able to do a better job on this.





I hope this was somehow helpful.