I am a book cover designer for several independent science-fiction authors, including those I publish through my different publishing houses.
Do you ever sell royalty-free licenses for your work? Are you on any of the royalty-free repositories? If so, which ones and what is your screen name there?
You have a wonderful eye and the images I have seen would make for great covers.
The image would, in all likelihood, be slightly altered to provide enough space for text and to point the action in the proper direction for the cover.
I would, of course, provide proper attribution and provide you a of the finalized cover for your portfolio.
Please let me know.