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@peppewediwis its like uhhh when you finish the line,coloring and basic shading you go above all the layers (line, coloring, etc) and you paint in more details, usually with a brush like tool so you can shade with the opacity and by color dropping (↓2nd picture by chim_chimmy_jimin on Reddit)
@Rusty_Penny_ i take from 6-12 hours, ive been drawing "seriously" for around 6 years i think??? ,,,,,