doesn't look like lens dust to me. you might need to clean your sensor inside your camera (that's if you can). probably not an option if you have a point and shoot camera but if it's an SLR, it's pretty easy to do. tons of tips on the web to show you how 
oh by the way. hardscape looks nice. although the very high contrast seems a bit much at this point... i'd have to see it again when there are plants. i like the rocks though.. where did you find them?
oh by the way. hardscape looks nice. although the very high contrast seems a bit much at this point... i'd have to see it again when there are plants. i like the rocks though.. where did you find them?