Just read an article on Pinterest, and what makes a popular picture on there. A company has spent a year analysing data from Pinterest and come up with a few things that might make your images more popular. Also mentions that the majority of Pinterest users are women.
Full article: http://www.dailymail.co.uk/news/arti...ong-study.html
And here's the most popular. Repinned 307,00 times, liked an additional 8,000 times and commented on 300 times.