Well done is better than well said.
If you've got a talent, protect it.
Go for it now. The future is promised to no one.
If you're going through hell, keep going.
It's always too early to quit.
Be gentle to all and stern with yourself.
Never complain and never explain.
Be thine own palace, or the world's thy jail.
Expect problems and eat them for breakfast.
Either you run the day or the day runs you.
There's obviously nothing wrong with selling your art - only an idiot with a trust fund would tell you otherwise. But it's confusing to know how far you should take it.