I am a type of artist who gets easily bored with one style of drawing or painting manner. Sometimes I use only computer mouse to complete haiga. Other times, I use sumi brush, crayons, pastel, etc. Sometimes, I like to employ geometric shapes, and the other times, I simply go ahead with free hand.
What style I choose is not from my willfulness, though. I peruse each haiku and determine the style best fit to its content. This is why my haiga works have variety of appearances, and I like it that way.