Relationship from Orders to Shop and Supplier, or to general User?

I have a platform where - a User can have a Shop, which can place Orders - a User can be a Supplier, which can see Orders from Shops coming in. I have created the following diagram depicting the structure I have modeled so far: Is that a *good* schema? Or, would it make more sense to *couple* the relationships to the User straight away? I'm guessing that will cause more overhead in my backend? (Laravel - PHP) Thank you!