How to draw rocks or stones with pencil

This is a time lapse video about how to draw rocks or stones with pencil. Rocks are another important component of landscape drawing. Wide bare land on a drawing can be filled with some rocks to make the drawing more interesting. Here is a high level detail of how to recreate this drawing:

Using a 2B pencil with very light pressure draw outline of rocks.
Now using the same 2B pencil start shading these rocks.
Consider that the light is coming from the left and some areas on the rock facing towards light. So do not shade those areas, keep the white paper untouched.
When that light shading is done, go back to the right most part of the rock and shade with little more pressure to build the darker side.
Areas where the rock is meeting the ground also will be darker as very less light is reaching there.
For each rock try to build their shape differently just putting the shading in different areas and that will look like more realistic.
Create cracks in some places applying some darker shading.
Finally add some grass to define the ground for rocks prominently and that will give a nice look instead of just rocks on bare land.

Let's watch the drawing for detail instruction and let me know if you like this. Thanks you.

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Music courtesy of Kevin MacLeod (http://www.incompetech.com)