I can't think of a really quick and easy way to do exactly this style.

Most of the existing methods to do this hachure type montain shading deliver only approximatly good looking results and have to be worked over by hand. But that Fenlon style uses also a kind of perspective... thus changing the length of the lines you have to draw. You cannot get that with the usual methods, like the one in the linked thread.

I am trying at the moment to work out a method drawing these lines not from one single curve, but between two curves. It still needs a lot of work, but it might yield fitting results. It might be to complicated to have a real advantage over drawing it by hand though.