It looks very simple, but, then again, most things do when they're just getting started. It would be lovely to see some decorative elements you're thinking of adding to make the structure less plain.
Now, for the criticism ... I think the door is too tall. If your game takes place in a world that doesn't have electricity, the shop would lose too much heat through such a large doorway - especially since this is a shop, a place that people go in and out of a lot. So, you would probably be more likely to find a smaller door; perhaps even one that taller customers have to stoop to enter through.
The door itself, though, would be perfect for a large structure of some kind, like a castle.
Keep working on it! :yes: