I don't think you need worry about it becoming almost monochrome, you've already added enough ambient green to get away with white engine glare (or maybe even the same sort of peachy colour that we see coming from the platform lights).

Nice reworking of the Sith shot though Vader has a bit of a stoop (he also tends to look up when thinking about the future).

The kneeling worked in ESB because no-one thinks Vader has to kneel to anyone and then this spooky weird guy turns up and we are forced into the situation of wondering how powerful this new chap must be.

Besides the kneeling position is a good way of finding a soft spot for sticking a blade in.