CHRISTMASZONE
I see. And how's your current method? Sorry for asking too much.

My current method is just a normal layer and I manually color the lineart. I select the color either from the shadows, or manually.

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Hi! I really loved your Rose Quartz! How did you color the lineart? I mean, are you using blending modes or something? I'm looking for tips so I can stop using black and grey lines. Thanks in advance!

For that image (I don’t use this method anymore) I used subtract on the lineart. You need to invert(-ish) the colors of lineart. For example:

image