It does look like dust...What is unusual though is that sensor dust usually shows up on the images as the fstop goes up....and that is not the case here. Also, the spots would not move around too much. zhounder may be right...it could be on the lens (perhaps on the inside of the element) as the images are taken with different focal lengths. But either way, it looks like dust. From the exif, the cam is a Sony cybershot....so, it's not a DSLR. The primary way for dust to get inside is when it is opened up. If you just got it repaired, this is a possible scenario....if so, I would take it back....they may have put the dust in there for you....

In youth, we learn....with age, we understand.