I send out a newsletter at least 4 times a year with general news, maybe some videos and idle chit chat that will hopefully be interesting. In addition I'll send updates when new work is available, started or something of interest comes along before I post on my social media accounts and the website, I may even speak on occasion!
Unless you are purchasing a painting then I will not ask for any other information apart from your name and email address because its none of my business!
Neither do I sell, pass on or otherwise supply your details to any other party, social media company or online corporation because, despite what many of them wish to believe, its none of their business either!!