Mike. The thing that would make the most difference, in my opinion, is adding crew men.
Good figures, and more than just a pair in the cabin, would bring it to life big time. Not sure what scale you have there but odds on that you will be able to get figures for it.
Adding colour is also a way of livening the greyness up. Small things like Red fire extinguishers, port/starboard markers…whatever…make it up, it all adds to the interest, even if it’s not strictly correct.
Ashley