Beginning at the top, the first two images are somewhat suggestive (not unlike an inkblot) but require some work to interpret. The third one is more likely to be seen as a human face, albeit greatly distorted.
But the puzzle is solved at the bottom, when a closer look reveals that all four have resulted from a single photograph of a harmless sleeping puppy dog. For more on embedded figures and picture puzzles, see this brief video, articles on Clemens Gretter, Gobolinks, and camouflage.
