This is breathtakingly beautiful! The shades of blues and the cloud reflections in the lake are amazing. I didn't notice the horizon until I read Jim's comment. What a beauty you have here!
Beautiful scene, but you'll want to be careful to keep your horizon level. As is the water of the lake appears to be flowing down hill to the right. It happens from time to time, but you should be conscious of it when you're shooting. The next time you're out there you might want to consider moving to the right a little. The trees are blocking the view of Wizard Island. that would have made the view even more beautiful. Crater Lake is so beautiful. I had a great time there taking photos.