Ah. Hmm. Not to make suggestions for a ‘finished’ piece (I missed the WIP, sorry), BUT…
If the clouds were just parting… then where’s the light? The clouds parting idea does sound very nice, but as it is, it just looks like a dull, foggy blur, and a bare hint of actual sunlight on a few edges. A swath or beam of rosy light cutting across the scene would work wonders.
If you were going for a mostly oppressive feeling with a bare glimmer of hope, then I think it’s pretty much there. If you were going for a dawning or achieving hope - you need more light in my opinion. And that would make it would much a much more satisfying and inspiring picture. I suspect you can even get away with doing it in post-pro. A lighten layer with a mask might do it and still keep the noisy-mist feel.
Also, I’m not sure what it is, but between the green dome and the green pyramid on the right side, there’s a round turbine-ish-looking structure. Is that supposed to have facets visible on both ends or should it be smoothed a bit more?
That said, it is very good otherwise - your hard work and patience is evident.