The hill's not bad in itself; but ask yourself, "what does it contribute to the image". My personal opinion is "not a lot" and that's all it is, an opinion.
As for the "dead" upper right, well you called it! It doesn't lead the eye anywhere it just wanders about a bit.
With the dark hilly bit taken out the eye is drawn to the "heavy" column and up into the sky. If the pink clouds were at the top that would have been good.
Cropping is usually the least preferred option to good composition because it probably means that the key subject was too small in the frame. Of course, it's sometimes impossible to get the subject where you want it by changing your viewpoint or simply that the shape of the sensor image is wrong for the particular image, in which case cropping is where it's at. And yes, if the sensor is 10MP it's less of an issue than if it were 5MP, but if you aspire to compose in camera rather than rely on cropping your images will improve. Just because you gave it some thought before you released the shutter.