How do you model low poly humaniods?

I’ve tried this tutorial, but whatever I make looks terrible!

without some basic knowledge in anatomy you can’t model a good humanoid mesh, it’s all about the proportions and “the flow of the muscles”; you don’t need some 3D tips but you really need some resources about anatomy or some reference photos.

try those tutorials http://cgcookie.com/blender/2011/05/06/modeling-the-female-body-series-part-01/