Yeah you will need to have an amazing portfolio and/or have a qualification in fine art to be considered I reckon.
Seems like you have a good talent.
In terms of stability you could probably make around £20 an hour once you hit your stride. Ultimately if I was in your shoes, I would have a view to open my own studio, so all the money you take is your own (as opposed to being paid hourly)?
At least this is what I think, I could stand to be corrected!
Good Luck