Custom pens I have been using for a majority of my illustrations. 
The example illustration is drawn only using O-Pen brushes & Oyun Nature brush pack: https://assets.clip-studio.com/en-us/detail?id=2095075
Includes:
O-Pen (Good for lining, coloring)
O-Pen (Good for lining, coloring)
O-Block (Good for painting, blocking in colors, opacity sensitive)
O-Tilt (Good for hair, sharp angles, rocks)
Heart Pen (Bonus: Good for lining, leaves, heart patterns)
Color mixing and randomize hue per stroke available on all pens.
You can adjust the angle of the tilt pen.
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If you'd like to learn how I use these pens, please consider watching my tutorials on YouTube: https://www.youtube.com/@oyunorka
Oyun Pen
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