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7. I make a new layer on top of everything and neaten things up using the dense watercolour brush. (I use this brush for flats as well.) Earlier, I also dropped the opacity of my lineart because I thought it was too dark. Here I also airbrush cheeks and hair.
6. I show the shading layer again and have it clip to the flats folder. Then, I alpha lock the shading layer and turn it dark red. Depending on the colour underneath (I usually do this for white), I turn some areas dark blue as well. I then set it to Multiply.
5. I add flat colours in their own folder.
Note: it's ok to go back and change whatever you want during any step! Nothing is set in stone. It's your drawing; make it in whatever order you want.
3. I hide the sketch and make a new layer under the lineart layer and start shading. Apparently renaissance painters used this technique of grayscale to colour. I use a brush that both applies colour and blends (CSP transparent watercolour).