I"m sure this has been asked before but who decides on the cover designs for the U.S. releases?
The editor at Pocket Books would commission and approve US cover art. He must work to strict budgets for cover art, and these have decreased since the days of fully-painted covers. So that's Ed S. (And the head of Marketing, I presume.) There would also be input and approval from John Van Citters' team at CBS Consumer Products. The authors may or may not get consulted, on a case-by-case basis. Some authors get more input as to preferences for cover art than others.
The German publisher is a much smaller concern, although CBS Consumer Products would still have to approve the art.