When creating cartoon work, you can add a bit more character to your lines by either using the Artistic Media Tool and choosing from stroke Presets on the Property bar, or by clicking on the Outline Pen Settings (F12), applying a width and adjusting the Nib Shape.  This essentially gives your outlines a nice calligraphic look and feel.

Tip provided by Joe Diaz, CorelDRAW Master, Graphic Designer and Sign Artist