I was curious to see what the result of another hour of squiggling on the last trumpet part drawing would look like.  The drawing is 6.75 inches by 4 inches.  It is not a technique to be rushed.

Two hours vs. Three hours

The top scan shows the result after two hours of squiggling.  The bottom scan shows the result after another hour of squiggling.

The trumpet is far less forgiving than the seashell.  I like the challenge.

Drawn with my Pelikan Fountain Pen filled with walnut ink.