My first try uploading here. Took it this morning at the lake close to our summerhouse back in Sweden. I am an amateur and newbie with LR so I think I overdid it a bit in LR, but would really appreciate any comments and advise. 5DMkIII 24-105L, 1/200, f/10, ISO320, 24mm. Please don't judge too hard.
The biggest problem is the blown cloud formations. For the best impact, you need to retain at least most of the detail. Essentially, there is only two ways of achieving that, HDR (of which I'm not a great fan unless done carefully to keep it natural) and the use of neutral density graduated filters. If you shot in RAW, it is sometimes possible to create three or more exposures from a single file, but I suspect in this case, too much detail has been lost, so it would probably require a reshooot (which would never be exactly the same of course), by either bracketing to get three or more exposures or using filters. Compositionally, it is ok, you have the lilies to use as a leading line, supported by the oultine of the hill reflection and you have some nice reflections to provide some foreground interest. If you can practice using HDR or filters (especially filters), you could make some big improvements. Also check on your white balance and choose your shooting times for when the light is at its best.