A vortex in your zentangle will draw the viewer's eye.
Start each line on a side at a corner of the box, and draw it across the side. That is what creates the darkness at the center.
Example of the Vortex pattern.
Links to Tangles, Tutorials and Giveaways is published on Mondays, Wednesdays & Saturdays Zentangle Challenges The Daily New Tangle C...