You're afraid because you're thinking about the end, not about what you're doing.
It's not what you paint. It's how you paint it. You don't have to paint elaborate things. Paint simple things as beautifully as you can.
See it in terms of paint. We don't learn subject matter, we learn paint. The musician can play any score that is set before him.
Gray is the queen of colors, because she makes everyone else look good.
It is in the contrast of light and dark that design happens.
The first thing you see is the last thing you do.