The first two stamps are from the set of 4 stamps issued on Australian water birds on 6th March 2012
60c, The Radjah Shelduck
60c, The Pink-eared Duck
The other two stamps are from the Fishes of the Reef Definitives series, first part. The series was released in two parts, the first on 21st June and the second on 28th June 2010.
Do feel free to add your thoughts, comments or suggestions
NOTE: Please click on the images for a larger view / closer look.