The rocks have always attracted me, synthesizing the different volumes, with their lights and shadows when the sun approaches twilight was tempting for my drawing experiments.
Have a nice day,
Javier
In this type of drawing I always try to start where the highest contrast is, where the highest gradient between light and shadow.
Around that point I then continue drawing in a kind of spiral, marking non-invasives hatching and in a way that they all melt until I find in the drawing what my eyes see.
Sometimes I get a good result, sometimes not, but I am devote of this method.