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Gimp & GMIC. Angel with colored pencils artistic effect.

 Anxo Retablo AnxoRetabloGmicBWEngraveCap2w

G’MIC is a full-featured open-source framework for image processing for Gimp & Krita: http://gmic.eu/

GIMP is the GNU Image Manipulation Program: http://www.gimp.org/

Krita free software for drawing and painting: https://krita.org/