Que lastima me da tu caso :I como sabrás yo hice esta pic y la usaré para un proyecto personal :I por algo se le pone la marca de agua no es para molestar
It is a little complicated to explein :c but I will try to help you xD I used Sai to paint the draw, you need to select all the draw, then yo go to selection and click like 5 times in increment, in other layer (to the end of all the layers) you new to fill the selected part with the color yo want and thats it xD