I think there are a lot of us out there with a lack of confidence. We're afraid the client won't like the finished work. We don't like the finished work.
It all comes down to what do you want to do? Do you want to be a muralist? If so, stop worrying about it and just do it.
The pictures I saw of your work are great. You definitely have talent. So use it! Post this picture on a "free listings" website like craigslist.com or another and see what happens.