Once you start to get a following, sending out a newsletter is always a good idea. That way you can promote any recently completed art work, any upcoming shows, maybe a coupon or special on your art, etc. etc.
You can always just send this out in an email to your fans, or you can use a service (this is what I did because I felt it looked more professional and it was easier to format) that sends out newsletters.
The service I went with is www.mailchimp.com. I went with them based off of a referral from a friend and because they’re FREE when you don’t have 1000s of people subscribed to your newsletter. Of course once you start getting a huge following and you end up sending out newletters very often or to thousands of people, you’ll have to start paying for the service.
Another service I got a lot of referrals for is www.constantcontact.com, but I ended up going with Mail Chimp because of it being free. Once my newsletter subscribers start pushing 500 or so, I’ll do a review of these newsletter services and see which one makes the most sense.
You can decide what’s right for you in terms of how often you send out newsletters, but I would recommend once a month or every other month (I’m sending mine out every other month).
Here’s how my first newsletter looked: http://us2.campaign-archive1.com/?u=eb288c707a9b697a0c1224f4e&id=0800518a1b