As long as the main body of the post is different to the previous posts you've made with the image, you can use the same image as often a you like. Curation posts do it all the time. The only time I think HiveWatchers would say it's reposting is if the main focus is the images, so the rewards are for the images rather than the written content. For example, photography posts repeating images would be considered reposting content.
Hope this makes sense.
It does make sense and is better than any other explanation I have yet to receive! Thank you.