This issue is a variant of Justice League (DC, 2011 series) #15 [Standard Ivan Reis Cover]. There exist further variants.
The image on this cover is taken from the pencils for the standard cover.
Throne of Atlantis story continues in:
Aquaman (DC, 2011 series) #15 Chapter Two
Justice League #16 Chapter Three
Aquaman #16 Chapter Four
Justice League #17 Chapter Five