In reply to Matt Amos:
At the risk of being controversial can I offer an opinion that reflects the approach of the early landscape photographers - specifically Ansel Adams. The aim should be to create an image that best depicts the one that you 'saw' at the time.
This is not to say it must be a sterile exact version but more an attempt to capture the atmosphere & feeling that was invoked by the scene. If you saw dramatic clouds then you must do your best to communicate that feeling to the viewer.
The great film photographers agonised over the technicality of doing this with the tools that they had at the time - chemical development & printing - which was quite crude - but we are not so limited.
Digital photography has opened up a huge range of tools & techniques to allow us to manipulate an image and this can be great fun and very creative but if done without pre-visualisation then it is digital photo art rather than pure landscape photography.
I feely admit to getting great satisfaction out of rediscovering new interpretations of digital images after the event but I get most satisfaction out of creating exactly the effect that I pre-visualised at the time by the myriad of editting tools we have available in Photoshop type software.
PS I played with your image and had great fun with it but I didn't see the scene so I can't really comment on whether I have improved it. It is very similar to DanArkle's version. One comment I would make is that both sky & mountain are equally powerful so I went for a crop that equalised them - thus breaking the 'rule' of thirds. You have to know the rules to break them!
Keeping taking the pictures Cheers Ratty