Shortlisted images from Environmental Photographer of the Year 2015 to go on display

I’m very interested to see image #4 has a ton of dust spots in the sky over the subject’s head, plus one big spot on the left of the frame. Before the trolls get their claws out, I’m not having a go – I’m just curious why these spots were not cleaned up when these images surely have had a lot of post-processing done, and in this particular image the subject’s outline has clearly been enhanced. Do some photogs simply not see dust spots? …