Adobe Illustrator brushes are among the essential tools in the designer’s workflow. To produce a digital illustration, they need a whole bunch: ink, calligraphic pen, paint, line art, or grunge messy brushes. A great way to expand the collection is to check Envato Elements (or any other design marketplace) or get a free brush pack from some blog. For example, a famous graphic designer, Chris Spooner, regularly shares some handy freebies.