It's not when you've created an entire fictional society for your character. Surely we've all done this.
It's not when you've created a language for them. That's not uncommon, either.
Nor is it when you sit down and work out just how they live - what they do to make money, to eat, etc.
But when you're working out just what kind of liquor they might drink based on the nature of their society and the things that manage to grow in their barren little pocket of the world? And how it tastes? And you photoshop bottles of it? Maybe then, yeah.
It's not when you've created a language for them. That's not uncommon, either.
Nor is it when you sit down and work out just how they live - what they do to make money, to eat, etc.
But when you're working out just what kind of liquor they might drink based on the nature of their society and the things that manage to grow in their barren little pocket of the world? And how it tastes? And you photoshop bottles of it? Maybe then, yeah.