Hi, Theron. I didn't cruize by here until today, then I found your question.
Look at the blue sky, just to the left of the building at left. See the two dark spots? They are about 2 mm in diameter on my moniter. Then look at the blue sky elsewhere. There are about 10 dust spots in the small patch of blue sky, which is just a small area of your sensor. I suspect there are lots of other areas, but you don't see them very well because they are lost in the detail of the falls. If you then look at the waterfalls you can see about a dozen other dust spots.
Next, tomorrow when you have your camera outside in bright daylight, point your camera at a patch of bland sky, away from the sun. close down your aperture to f22, and expose so that your about one stop underexposed. Those settings will increase your chance of seeing dust spots. Take your card into the house, load it onto the computer, and be amazed at how much dust there is.
The problem with this is the same problem that you get if you enjoy expensive wine. Once you recognize the difference, you always want the better product. Once you recognize these dust bunnies, you will find them very annoying.
Fortunately they are easy to remove, and if nothing else you can clone them out in photoshop. If you want advice on how to clean your sensor, you could email me at dr-holland@shaw.ca. I use a "visible dust" brush, but unfortunately they are expensive. You could search for other options on photo.net. Just remember that you don't want to be putting any liquid or any compressed gas near your sensor. If it's not too bad you could try a HAND blower bulb, but be careful.
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