I'll start by saying I think its great work, and its so awesome you're doing this!
My only gripe with it is as mentioned above, outside of that its just minor artistic stuff and 3D issues.
I've put together a quick imgur album here:
https://imgur.com/a/p7aj1I've noted what the issues are in particular scenes, and most of these are easy to fix honestly.
I'd like to ask if you're using bump maps or normal maps, and it seems you aren't using displacement mapping really, except in perhaps 1 scene.
1 final thing, Texture resolution, it looks asthough your texture resolution is inconsistent, some objects have stretched textures across large areas, whilst smaller objects have a lot of detail packed into small areas. You could help alleviate this by using texel density.
Texel Density may be a bit more specific to games, but for achieving a cohesive image, it still works well.
Here's a really good breakdown of Texel Density:
http://leonano.com/ALTRO/pdf/Leonardo_Iezzi_Texel_Density.pdfI hope I haven't offended you, I really think you're doing awesome work.
I can't wait to see this project completed.