I'd say, amateur ... commission ... artist? My father has sold paintings but he's not particularly well-known ... I never sold art in my life but I don't feel that selling a work or two would mean much in means of accomplishment. So far I've drawn for myself and I'd do commissions if I felt like it.
I think it would all depend on how the artist who is doing commissions looks at it. A lot of artist who do commissions regularly, I would consider no longer a hobby-artist. I still consider myself a hobby-artist even though I do commissions cause of the sole fact that I am not as good as a professional.