Similar to geishas, the "sing-song" girls (also known as 'flower girls' were trained from childhood to entertain wealthy male clients through companionship, singing and dancing in special sing-song houses. While the practice of concubinage was officially made illegal, it has recently been popular amongst the wealthy in China as a result of the country's prosperity.
Content development complements your photography and helps you grow and earn beyond your photos. If you're a gearhead like photographer Colby Brown, you could write in-depth gear reviews, or publish post-processing tutorials like Elia Locardi, or write a how-to book like Nicole S. Young. If you enjoy travel writing, you could build a popular blog like photographer Chris Stevens, who writes travel guides and reviews popular hostels and adventure tours, complete with photos.
Lyn's last tip is to have your own website. "Show off your work on Instagram and Facebook, but do ensure you have a good, easy to use website too. It should have some of your best work (with lots of keywords!), any specialities, and awards/competitions you have won, and your contact details. It's too easy to get carried away, add thousands of images, and forget the basics. Keep it simple."