Since you posted your 2 photos there, perhaps I can critique them?
The 1st one is quite a nice photo of the clouds, but the tree stump there is very distracting. It does not provide a nice foreground interest, so I'd suggest that you reframe to exclude it or clone it away. Also, it doesn't help that the horizon is smack in the middle.
For the 2nd photo, you have included the buildings at the bottom. In such weather, the colours will be completely washed out, so they appear dull and under-exposed. I would suggest that you pan upwards to exclude at least the bottom 1/4 of the photo since they don't actually add any aesthetic value. The clouds here are not dramatic enough to stand on its own, so I think you would have to keep some buildings to make things more interesting. 1/3 buildings, 2/3 sky perhaps? And since the colours are so poor anyway, I think you should try experimenting with black and white or sepia.