There are many ways to find great images for book covers and I have used several methods for our 12 novels:
2. An online photo supplier ie., Dreamstime.com or other such photographic supplier where you purchase for a small price a license to use a photo for a certain number of copies (covers, articles etc.). You have to read the rules & reg. I paid less than $100 to use this great image of a Spanish ship for 10,000 copies. I would be very happy to pay this amount again when we sell 10,000 paper/ebook copies of Race For a Treasure!
3. When all else fails and you can get the photo you need, take it yourself, as I did for Whispers Across Time (Fiction). It’s not always that easy, as this photo proves … I took during the daytime during the early writing stage then realized the cemetery scenes all took place at night. Photoshop to the rescue!
4. Our first cover, Lizzie, was a Renoir painting in public domain. Our graphic designer (for lettering etc on cover) found this on a website and the original image had been somewhat changed (colour etc).
I hope this gives you some ideas and inspiration for your next cover.