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Agreed broadly with Scott and Bob.
It looks like you used a wide lens (20-24mm equivalent?) and at the very least crouched to get some of the shore. If so, I like that. The overall composition has some good elements, but IMO it doesn't come together as well.
If you're looking for a wide shot of the sky with just enough of the ground to give it some context, it's IMO generally better to have a just enough of the ground in the shot to give context, but then have the rest be the sky. And in such cases, patterns in the sky make or break the image.
For this subject, rather than a wide lens I would have used a telephoto lens (at least 85mm equivalent, perhaps even 120 or 200mm) and tried to get the lightning, the clouds, and the opposite shore. Since the subject I see is the lightnig, the clouds, and the other shore in sort of a Z-pattern, I would leave out those elements. Given the width of the opposite shoreline and the clouds, I would crop to a longer aspect ratio. I also think this looks better underexposed by a stop, though I would prefer it exposed like this from the camera (i.e. get as much good data as possible from the camera even though I intend to reduce expose in post-processing).
Something like this, though this is a difficult to thing to get out of a crop from a wide angle lens, even more so from a jpg at this resolution: