Well if this is really your first go at TG2 then you're creating expectations now
This looks very nice already. Like the realistic touch in the haze colours, it's slightly greenish at the horizon which looks very good.
Didn't reducing the haze and bluesky density clearup the image? I think reducing the haze density will do most of the trick.
The clouds look good. Maybe you can reduce its coverage and add another layer with taller clouds for variation.
Good work!
Martin