From world record breakers to the most iconic image of all time, these are Guardian Australia’s top three photos for April. Photographer and picture editor, Carly Earl, hand-picks three photographs as her favourites every month and explains the craft and composition that makes them special. April’s edition includes a quiet, intimate moment of record-breaking athlete, Gout Gout, a picture perfect court shot of Kyle Sandilands and an awe-inspiring image of Planet Earth that puts everything in perspective