I like your composition and it is a great landscape. It doesnt seem over saturated to me, but, for my taste, the clouds are a bit over dramatic, and I wouldnt darken them or increase the contrast as much. In fact the process has introduced contour lines in the cloud, which is probably due to processing on a JPEG and that did not have as much information as a RAW, and could not provide the data needed for the icrease in contrast.
In any case I enjoyed your image.