When one draws or paints for pleasure, it is for the freedom of expression, the experience of creativity, the joy of making something from oneself.
When one is an artist, there is a purpose; to be the consistent driving force behind an idea, more than an image, more than just the occasional artwork - it is a body of work that must resonate thought and emotion, with intent.
Start as you intend to finish. If it is a game, it will always be a game. If it is a reality, it will evolve into a world of its own.