Zentangle art is non-representational, meaning that a Zentangle is not meant to look like anything other than a Zentangle. And it will always look like a Zentangle.
When you start a traditional piece of art, you usually have the outcome in mind. You begin with a sketch, and during the process of creation, you continually evaluate whether it is getting closer to the desired result. Failure to create something that you intended can lead to frustration and disappointment. If you have ever tried to make art and felt that way, try the Zentangle Method.
Because Zentangle is not meant to look like anything else, there is no need for fear, doubt, and judgement. What is there to compare it against if there is no desired outcome?
There are no mistakes: when you sit down to make a Zentangle, it will end up looking like a Zentangle. Still having trouble giving up judgement? While not directly related to art, this article may help.
Missed the beginning of the series? It all starts with Appreciation.