Lina
I would look at it glass half full. I cant take a photo - so it costs me or clients 1,000's if not 10,000 for photography. You clearly can - so cost effective and you can control what goes onto your site. You are in a great position. Upsell original photography...
I also think though it is a factor it is not high ranking factor (yet!).
I also found a great WBF for you. https://moz.com/blog/panda-optimization-whiteboard-friday - states the position better than me!
good luck, photography is a great talent to have.