I have taken screenshots of most supply/demand levels drawn by Sam Seiden in his FXstreet webinars from 2007 to 2012. These examples have helped me train my eyes to spot the good levels on the charts. The file includes around 200 screenshots.
I hope you find this useful.
https://mega.co.nz/#!PMkUEYzJ!UIFlIW-1S1U_MJdrzw1CB1HLnqE5WeMBI9ab46AxjZY