Great shot H,
I tried graduated ND filters on a photo workshop at Cradle Mtn. I sold them afterwards. I found it was much simpler to shoot two photos - one exposed for sky and one for the landscape and blend them in PS.
PS now has various "filters" that emulate most of the available "real glass filter" you would screw onto your lens. IMHO, the only one you can't replace in your kit bag is a polariser.
The other advice was to learn to shoot in manual mode and "read" the histogram.
DT
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