Like the contrast you got on
the critter you worked to
more of a finish.
I know that mechanical pencils
are the weapon of choice for
many in these forums.
They have many limitations that
out weight the non-sharpening advantage.
The leads are made with a
different binder than regular pencils
to keep them from breaking.
Them make it difficult to get much
contrast because of the breakage issue
in the softer sizes.
Because you can't apply much pressure
you have to build up to many layers and
destroy the paper surface.
Particularly the printer papers many use.