I didn't really have a plan for this illustration. I just drew the girl than decided what to do afterwards. At first it was just a value sketch but I quickly decided I should try to colorise it with colorise and overlay layers since I usually don't work that way.
I'm not really sure if it's more time efficient to work that way since you still need to paint a lot yourself, and in the end it feels like you did twice the work. But it kind of helps to just focus on disign and value without having to worry on colors.