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I think its a good capture and I agree with Ben about the silhouette and just keeping some detail. The sun's rays are a strong visual element nicely captured.
Unfortunately I dont think the image holds much sustainable interest. Sorry you were limited by bad weather, but since you are a Mainer, guess there is a good chance you will get up to Acadia again with better opportunities.
What would make this work better?
Greater color range in the sky.
More clouds with the sun peaking through or varied lighting from backlit, underlit clouds and layering of colors.
More dramatic shapes silhouetted. This one may not be fair. I have been up there several times and I think it is a challenge to find a new and different comp and I recall the rock shapes as you have illustrated.
If/when you get back, think about finding your way to "Boulder Beach" and shoot towards the islands or towards Otter Cliffs at sunrise. Or head down to the lighthouse and carefully get out over the rocks for a shot of the lighthouse illuminated around dawn.
Finally, if you are not aware, David Patterson (on FM) is a local expert about photographing Acadia, is generous with his time and suggestions, and posts beautiful images on Landscape.