shading for a cell

i have recently been experimenting with cell shading, cell shading is when a block of colour is used to eather darken or lighten an image rather than blending.
Before now i have found this hard to do as it is my natral instint to blend.
below is an image of "Link" from Zelda who is coloured in the style of cell shadeing.


Below is an image that i coloured in this cell shading style. You may recognise the drawing that is shown before.



Link image taken from www.gamersmark.com