So far this image has a wind driven feel of calamity, looks good.
You wrote something about this being related to the 1800's. I would personally add at least one object that identifies with that time period such as some form of architecture or even a boat off in the distance of the sea that looks like the 1800's. The image looks great as is yet I never would have known this was to be used for a book based on a story from the 1800's. The image as is looks timeless. Then on the other hand I have no idea what the story of this book is about, maybe you intended the image to look timeless based on some important part of the story?