How To Paint Digitally over a Pencil Sketch (GIMP) by nataliebeth on DeviantArt
3.5. Pencil
3.3. MyPaint Brushes Dialog
Real Pencil Brushes for GIMP by elmerucr on DeviantArt
Make any photo into a pencil drawing with this plugin. https://github.com/LinuxBeaver/gegl-pencil -drawing---GEGL-renders-your-image-as-a-pencil-drawing/ : r/GIMP