was considering this recently and came across something interesting. This photo studio in berlin charges different prices depending on where you plan to use it. Also curious whether that is common practice?
35 euro: for private use in applications, social networks eg Xing, LinkedIn, Facebook, Instagram etc.
80 euro: You acquire the full rights of use to use your portrait commercially eg for websites, brochures, business cards, publications in books or magazines, all without time and space restriction.