While we are on the subject of ID, and its now snake season proper, i thought I would remind y'all that I also co-authored a website (with Adam Francis) dedicated to the snakes of Hong Kong,
called, funnily enough, www.hongkongsnakeid.com
it has a listing and pictures of common venomous - as below - and harmless snakes.
Click on the picture and you will be taken to an in-depth feature on that snake, including lots of useful details as well as a gallery showing different morphs and juveniles and adults for easy recognition. Like this for the Indochinese Rat Snake.