Blogging is a must for artists, a great way to display your work, connect with your prospective buyers and collectors!
People come to your blog out of choice and not any compulsion. If you remember this, the rest is not important enough.
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.