Positive and negative shapes. My Zentangle hummingbird. This is an example for my students' project. This can be use for several concepts: positive / negative space, reflection, line and shape, etc. I did this project with my grade students.
One of my most popular pins, this “How to Draw a Tulip” tutorial shows just how easy it is to do. It’s also a great example of a wet-on-wet watercolor technique that can create lovely multi-colored flowers.