Annah, Colour/Cleanup Talk

I've spent all day doing an illustration of a character, i never really do complete illustrations, something that needs to change, (Mainly because it takes me a long time to colour/lineart) the only way i know to colour, is to do the light source then shadows/highlights, then put through a blur, im really wanting to know how to colour and do linework sketchy. i really like the work of Piyotycho and want to get my stuff to look a bit more like that. (sorry i have no idea how else to explain it).

(i get really annoyed how every time i type Colour google says i spelt it wrong. too lazy to add to dictionary hahah )