Picture into sketch

In gimp I have turned my picture of the deception pass bridge into a sketch.
Above is the original picture i took
And to the left is what i made in gimp








with this picture, i took a picture of lined paper and pne of deception pass bridge.
then in another window i took my picture of the deception pass bridge and turned it greyscale.
then i pasted it into the lined paper image and scaled it.
after it was scaled, i photocopied it (Filters>Artistic>Photocopy) and played with the settings until it looked relatively like a sketch.
then i used the color to alpha tool to erase the white parts i didn't want on my lined paper (colors>color to alpha) (alpha to white should be automatic)
and then perspective it (should be in your toolbox... if not then Tools>transformTools>Perspective. or shift+P)