Hi T-Jane,
It's a great picture and I hope you have the raw file of that shoot. There is some noise (sorry, but if you look the sky, you will see it and I have also seen it in the ice...) That needs to get corrected.
Also, there are no blacks, and I think adding some local contrast (texture in Lightroom and ACR) will bring up more structure. And I could think about lowering the whites a bit. Look at the histogram. That will give a nice clue about what is missing.
And then you need to correct some lens or sensor dust (cloud in my screenshot). Additionally, you need to correct a lens/sensor flaw at the border of the white ice and the blue sky (arrow).

Always check your pictures at 100% and/or 200% size. You will see more flaws than you like...
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