My way:
1) Take a photo of the fantagian (Prnt Scrn on your keyboard)
2) Open up the program you want to use (I use paint so I don´t know about other programs X3)
3) Cut off any unwanted background bits
4) Zoom in on the photo
5) Select a colour, then click more colours and choose the darker version of that colour
6) On the photo, using pencil, colour in the darkest shade in the hair/clothes/skin
7) Go into the ´more colours´ and choose a slightly lighter colour
Colour in the second darker shade
9) Repeat steps 7 and 8
I´ll be on my own laptop soon, so I might post some pictures to show you where to click and stuffs :9