I usually sketch down everything I want in the picture. So that includes the outlines of even the cut out for the charm and the hole

Inking [Layer 1]

So I usually clean it up and add in the details. Note: the gradients in the lineart and color came AFTER I finished coloring the skin. I simply forgot to screen shot prior so OTL]

Inking [Layer 2]

Last layer and I kept the stars and the constellation lines on their own layer. They were originally colored BLACK only but again, I forgot to screen shot so this is the end result AFTER I finish coloring in the whole thing.

Finished Piece

I color the skin and clothes and hearts on one layer. The background and stars are on a second layer. Then merge it all together and done!