Christina: I am really poor at critiquing post processing so I will leave that to the experts on this forum; these are just some landscape shooting thoughts . Take it for what it's worth.
I may be off here but this may be part of the problem. You see these glorious clouds with colour and texture. You shoot the scene. When you get the image out of the camera they are muted and small. Why? Where have those glorious clouds gone?
Almost all my landscapes are shot with a telephoto zoom, 70-200mm and often with a 2X extender so the effective lens is 140 to 400mm. I will rarely use even the 50 mm. I find that most of the prairie and seascape stuff I do needs a telephoto to get what I see in a scene versus what the camera sees. Below 50 mm everything is so small. My feeling is that my mind tends to see small pieces of the landscape not the entire sweep so I need a lens that will allow me to isolate the bits I want to emphasize. But sometimes I need to see the entire sweep, you have to think about what you want and select the lens accordingly
Two examples: this was shot at 28 mm because I needed the clouds and fence to be equal components ; the sweep of the prairie needed to be emphasized
This was shot at 200mm because otherwise the sunrise and mountains were a pathetic little smear of colour on the horizon and my mind saw the floating buoys and sunrise colours on the water as being as important as the colour in the sky so I needed a dramatic sunrise and the foreground. I needed to compress the scene to get that.
Food for thought anyway.