The OTRS ticket below confirms that the photographer Bodo Sperling is the owner of the account User:Bodo Sperling and is the copyright holder of all works at sperling-art.com:
This work is free and may be used by anyone for any purpose. If you wish to use this content, you do not need to request permission as long as you follow any licensing requirements mentioned on this page.
Wikimedia has received an e-mail confirming that the copyright holder has approved publication under the terms mentioned on this page. This correspondence has been reviewed by an OTRS member and stored in our permission archive. The correspondence is available to trusted volunteers as ticket #2011102210008849.