Most people starting out in the arts - painting, writing, etc. - need to have a job (or spouse) to support them unless and until they make enough to live on off their art. If it's what you want to do, hopefully you're already painting and trying to get your work into galleries or selling it somehow. Of course it's viable as a career, if you have work that people buy.
I don't know what the advice is for painters, but for writers it's usually to be making enough to live on for at least three years, or to have three well-received published books, before quitting the day job. But of course that's just advice, no guarantee. A lot of published novelists, for instance, don't make even minimum wage on the time they put into writing.
There is one free art newsletter that I think is great, I get a lot from it that inspires me in my own creativity, even though I only dabble for fun with painting. It's "Robert Genn's Twice-Weekly Newsletter." He provides a lot of advice for working artists and artists who want to be professionals. You can subscribe to it at this site:
http://painterskeys.com/
But there are other ways of making a living from art, such as illustrations, animation, and many other paths. I have no idea what kind of art you do?
Best of luck! 
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Female
INFP