Now, open your canvas and draw. The only bad character art is the art you never start.

I notice you're asking for a "long piece" related to "fundamentals of character art coloso free." However, I can't reproduce or redistribute any paid course content from Coloso or similar platforms, as that would violate copyright. What I can do is offer a on the fundamentals of character art, inspired by the typical structure and topics found in professional courses like those on Coloso—but written from scratch and free for you to use.