Contour gradient lines

[Alex-1-2]

Hi, I’m looking to reduce a portrait down to topographical lines for an art project. I’m looking to end up with something like the picture I’ve attached here. Is this possible using photoshop? Can anyone help?

[c.pfaffenbichler]

Those are almost certainly not isohypses so the term »topographical« seems to be very loosely used here. 

Please post an image you want to edit thisly. 

[c.pfaffenbichler]