Go for it now. The future is promised to no one.
If you're going through hell, keep going.
What you do today can improve all your tomorrows.
Quality is not an act, it is a habit.
You never know what motivates you.
Well done is better than well said.
Always desire to learn something useful.
After a storm comes a calm.
It's always too early to quit.
Who seeks shall find.
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.