https://paste.pics/R0CEX
The top layer (lineart) you use the tool that is visible and just scribble all over it until the lines r covered
Second one you just pick up the lines, paste them under and fill in all the pieces and use the same tool visible to color the design
u can use that one tool that only colors what layer you;re using and you make a layer that has only the lineart on it and copy and paste the lineart and then color on the bottom layer with the copy and pasted version