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Thank you!
It's a normal ballpoint pen on paper and layered in photoshop with a negative + color blend...

So, you drew it on paper by ballpen and scanned into photoshop, layered with a negative + color blend. It's cool!!
Your original drawing on paper is awesome, anyway. It's like Photoshop polished it.

yeah it's even a smartphone photo :)
IMG_20180803_123817.jpg