Intentional structures and frames help organize your sketches. In the absence of them, it's a clutter raw mess of information and ideas. Use storytelling structures like beginning, middle, and end to organize your thoughts. Additionally, consider using a metaphor to bring a creative aspect to your sketch such as climbing a mountain or branches of a tree.
Slow down to make your writing legible
Handwriting is important because we're not playing Pictionary. If you're like me, your handwriting rivals that of many doctors. One of the best techniques is to simply slow down. We're so used to typing on keyboards that we've forgotten how to write.
Consider writing in all caps because it forces you to slow down and capitalized letters are made up of mostly straight lines and circles.
Add a heading to your toolbelt
In order to bring order to your sketch, you'll need at least one headline "font" in your tool belt.
Use a thicker marker
Outline and fill
Learn some decorative hand lettering
If you're ready to take your lettering to the next level, add a few decorative techniques to your library.