I was looking to see if anyone had any ideas on how to start bigger pixel characters, like in http://vimeo.com/35259959

I want to achieve something like this  https://31.media.tumblr.com/29fcf80ee6cf73c1d85d106888a8fd55/tumblr_n3o792EaZM1rb1rgoo6_500.png

If there are any rules, tips, tutorials to follow, I would really appreciate it. I am trying to get some bigger characters for a game idea I am working on in my spare time.

Cheers!