Information about licensing and usage of my photos:
"Free" means: Free of charge, but protected by copyright laws.
My photos published at Wikimedia are licensed under a Creative Commons (CC) License. This means, you may use these photos free of charge, but for a little immaterial equivalent: Name author and license. "Photo: Martina Nolte, License: CC by-sa 3.0 de"
In this case, consultation with me is not required.
Images licensed under CC-BY-SA may also be used commercially. Other rights like i.e. personality rights or trademark rights still have to be respected.