G'day mate,
Looks like a nice spot... Yep, the horizon's a bit wonky but that's easily fixed
The dynamic range in these is quite extreme/wide so it would be difficult to not blow out the bright cloud highlights and still have good mid-tone detail in the distant trees etc, unless you have a play in Post Processing... Looks like youv'e done well exposure wise to keep detail...
The sky tends to dominate in these, I'd suggest to try and have some form of foreground subject, maybe a rock, a tree, logs make terrific foreground subjects

Something to take the viewer into the image, all the subject detail is distant which can tend to "flatten"' the image a bit I think...
PS: edited to fix bloody typo's