As an artist I think instinctively you are already an entrepreneur.
Essentially the two terms evoke emotions and actions that are one in the same. The passion and drive to do something that you are passionate about - even at the ill reception of others. The relentless hours of dedication to this vision. The find a way, can do attitude. The confidence. The swagger.
Artists and entrepreneurs alike are no stranger to ego centric thought. We live and breathe by our ideas and often dismiss any thoughts that do not align directly with our own. I was guilty myself of this during grad school - while pitching my thesis idea- to loathe the criticism of my professors and even question their merit, talent, and own artistic abilities despite the years of professional and teaching experience they had acquired.
Entrepreneurs face similar moments, especially as an idea is not proving as fruitful as was once expected. While to any degree this is normal (even a great idea takes time, experience, and a great team around you) to grow and succeed there is also a point that a business will face where success, in the current model, has not and will not succeed. This is a harsh reality to face, but one that must be examined - quickly- before negative consequences follow. As an owner or founder these consequences become all too real and personal - not only affecting your own situation but also that of your staff, your funders, and the people who believed in you.
Just because an idea isn't working doesn't mean the idea in itself is bad. It just may need to be retooled. I relate this back to my Grad school critiques at Pratt, the professors always eager to toss in another nugget of reference, another viewpoint, to see how the initial concept would grow and change over time. In business we see this as a pivot. A hard and fast transition point in a company where failed strategies are retooled and reassessed to correct error and find new ways to grow.
A pivot point can be a scary moment, but also an overwhelmingly exciting time. Its a moment to reflect, to change gears - redirect and redirect fast. A pivot can completely change the face of a company and has built some of the major organizations we know today such as Groupon.
Bottom line if someone comes to you with a new idea, or a position that they might know or see something better than you, dont immediately write this off as a negative thing. Maybe they do know more, or see something you overlooked. Maybe you are aging out of relevancy in your field, or lack the motivation/drive to move it to a new market. Whatever it is don't be hard and fast in your ways, like they always say "change is a good thing"
O and go watch Silicon Valley. Hilarious.