Sketching Portrait

I took this picture to imagemagick 

Matted out the white background

By fuzz-9999. (This step is totally optional )

I made the image gray at colormap

I went to effect – then pressed edge detect and emboss- 1, white thresh hold-1, and blur-1

Enhance – normalize, and effect -blur-1

Coloring

To add  color  I took this brown background to composite and compose –overlay by 

clicking the radio button  ‘tile  across and down the canvas’

I then saved the image as jpeg. 

Another Sample