In a pinch, I might try this with saliva and my finger! Softer tones alongside ink lines build an excellent contrast and could make your drawings a little more lifelike. This method is excellent to make interesting designs or enable convey a thing that additional of the natural search. https://ink-pen-drawing-technique29108.ivasdesign.com/58181888/the-greatest-guide-to-how-to-draw-with-ink-pens