Decide want it is you want to communicate with your brand illustration. This will then allow you to develop a clear narrative and create a strong starting point to tell your story.
Knowing yourself and your audience will help inform which illustrative style will be the most effective in delivering any message. This is sure to result a super successful final brand illustration.
Understand how colour and shape work to communicate an idea. Are the lines soft or angular and what is either choice trying to achieve? Are the colours bold or subtle? These design choices will affect how an idea is received and understood.