As you can see, where the error is
in this picture, the Iranian state media added a fourth missile “to cover a grounded missile that
may have failed during the test,” the agency said. It was believed to be an authentic image of missile test fire in Iran when a bunch of big newspaper companies such as the Los Angeles Times and Chicago Tribune printed it as legit. However, "the actual photo was taken in October 2006, outside the Iranian City of Qom." Notice if you zoomed in closely at the sky around the faked missile image, it's the same pale blue colored gradient as the higher missile it was chopped from. Even "the contours of the billowing smoke match perfectly near the ground, as well in immediate wake of the missile," meaning the second photo is clearly photoshopped in.
