Heres my tuppence worth...for what its worth!!!
Your shots are good, your sky and water are superb, you obviously understand how to place the aircraft and use the light properly but the scenery lacks... something.
I notice this in a lot of FSX shots, amazing sky, amazing water, but the scenery just doesnt cut it somehow. Good bits but mixed with some odd bits. obviously this isnt a fault of yours but the limitations of the sim itself.
I look at real world photos and also when im out and about, the view from hills and so on... just what does 'our' world look like?
TBH it looks nothing like it does in the sim, wether its fs9 or FSX. Here in the UK we have the eternal 'haze' and visibility is never more than say 10-15 miles? Are we creating shots that look good in sim world or are we trying to create what may be considered life like and 'real'?
The way scenery shows in FSX puts me off trying to get it to run well. I dont know what it is, but theres these strange blurry bits, even in fly2e's shots, which are usualy brilliant, full of vibrant colour and visually stunning- but they are still there..!
Im not criticising or anything like that, just how i see it.
My rules are simple. If the scenery and the weather conditions 'look' real then i use them, or try to configure them to 'look' as real as i can. If the scenery doesnt, then use your strengths in the sim. Water and clouds. In Fs9, the water is obviously ruled out, as ive yet to find anything that makes it look as good as in FSX....
With a bit of easy fiddling with cloud bases and visibility the sky is easy to get 'real' , a decent aircraft can easily complete the image and fool the mind into thinking what it sees is 'real' and not a 'sim' - thats what i strive for and those odd bits in the scenery in FSX immediately 'pop' (sorry Club!) out to me and say 'this is from a sim' ...
This is only my take and no amount of fiddling with the set-up will give you great scenery. If it looks good it will be good, if bits of it are good, then only 'bits' of it will look good. Im not having a go, just explaining how i visualise what a screenshot should be about!!
Dusk and Dawn are fine situations to use, but you must use the light correctly. Youd never take a photo looking at the sun, and personally i'd never take photos in the dark - the light effects may be brilliant, but you cant see anything! Youll never see night time shots from me

The Sim itself limits us in what we can produce, but if you try and create what you see in the 'real' world then you cant go wrong.
These views are mine alone and others may not concour, and yes, some of my screenshots are horrendous, i dont profess to be an expert, and im always looking at ways to find 'somthing else' in a screenshot. Its bloody difficult!
But its interesting to see your posts with various methods and different configs in your sim!!!