You got dust bunnies like mine, I had smaller dust spots and blew it off to leave larger marks like this, I think its silicone from the inside of camera from new, how about your thoughts.
Man, that spot above the person's head is really distracting; it's the first thing my eye went to. When not submitting for this contest, I'd recommend you quickly clone it into oblivion.
great angle and subject, it just seems to br missing something to make it pop, maybe if she was leaning over the edge a little or wearing something brighter.