Mental health was the theme for the 2020 prize. You can see all the winners on http://wellcome.org/our-work/wellcome-photography-prize/2020. I particularly liked the winner of the Mental Health (single image) category see below:
Holding on to Daddy
Manchester, UK, 2018
Benji Reid suffers from long bouts of depression, and after a particularly difficult period he created this image as a ‘love note’ to his daughter for being there in his time of need. Both of them are engaged in acts of escapism – her mundanely, through her phone, and him fantastically, as a ‘broken astronaut’, floating up into the air. But he’s tethered to her, and the simple, comforting fact of her presence keeps him in the real world.