Never. I have no limits to how much I can grow and I know that what the pro's are doing isn't going to be that hard for me to get to. It just takes time and practice. My artistic abilities right now aren't top notch because of school getting in the way o practicing but I'm still trying to test myself with the hardest compositions possible to sharpen my skills.
'If you don't make mistakes, you're not working on hard enough problems.And that's a big mistake.' - Mr. Delicious