First I mold the skeleton of the character into whatever pose I need, this allows me to keep her proportions the same.
Rough Pass
Then I fill in more of the details. I use a different colour for each component, for example her hair is blue and clothes are purple. This helps to keep everything very clear.
Colour Pass
I then fill in the colour.
Final Pass
Last of all I outline the character and add any details to her face or clothing.