Wow. Truely stunning vig. I
It captures the scene very well, and although it may be a tad cramped, it's still fine as it's not too smalll as to invade the epicness of the scene. The window is incredible. It's a shame it overhangs, but I personally couldn't care less. Amazing entry.
However, I do have a couple of small hesitations
A) The stairs being grey. I know what you're trying to accomplish with this. And it's not bad. But I think it sticks out just a little too much. You could prehaps use 4 1x2 light grey grills on a 1x6 black plate to create a darker effect?
B) The grebling on beside the emperor. I Like that you've tried to add to the scene, but I personally feel that the grebles don't go with the perfection and harshness of the empire. Some lighter grbles would look great, but in this case, in this scene, in this scale, I think It's a bit too much.
Up to you if you want to take any of this into consideration, And you have a lovely entry none the less. Good luck!