Aggred with Bingo. ANH's framing was masterful even with its simplistic aesthetics. Deathstar covered all the screen in shots like when MF tracked witht he beam. Massive!

Watching that you are borowed 3d models from Sci-fi 3d (credits goes there) i suggest that since you have the ablity to move them in 3d space why not have different angles with more dramatic impact.

Rule of thirds, curves instead of plains,diagonal lines and forced perspectives can give the depth and the mass of the Space station.

In your shots there is no overlaping and it seems that the Stardestroyer is massive against the DS.(overlap=distance=depth. All together=plain)

Also some shots i may be wrong but look visualy right. so you can try that path :)

-Angel