I often use the same photo on different hubs (esp medical hubs) and have been doing so for over 2 years. HP has never flagged a photo. The only thing they look for is duplicate content in your writing (verse, prose, sentences, etc.). Now that...I have plenty of experience with!
Because others have copied my content, I have been accused of duplicate content on my own original work because others have copied it into their hubs, websites and blogs and identified it as their own.
Photos - as long as they are YOURS or public domain, go for it!