I recognize your pic of four of Saturn's moons in profile against the ring. This photo came from the Cassini mission. I have posted that very picture myself. The large moon is Titan. The second largest is Dione, and it can be seen on that moon just above the rings. A small moon named Pandora orbits Saturn beyond the rings on the right of the image. Lastly, Pan can be seen in the Encke Gap of the A ring on the left side of the image.
It's a beautiful photo!