Engage readers with well-researched and creative blog posts. At the end of it ask questions or feedback from them.
Grammar - Depending on the language you use, blogging just makes it imperative that you are reasonably good with your grammar skills and proficiency if not a master. Remember your audience is a mix of both; the ones who are experts and the ones who are not.
Blogging is a must for artists, a great way to display your work, connect with your prospective buyers and collectors!