TypeError: create_superuser() missing 1 required positional argument: 'profile_picture'

Well, you need to create the create_superuser function as well:

class UserManager(BaseUserManager):
    def create_user(self, email, full_name, profile_picture, password=None, is_admin=False, is_staff=False, is_active=True):
        if not email:
            raise ValueError("User must have an email")
        if not password:
            raise ValueError("User must have a password")
        if not full_name:
            raise ValueError("User must have a full name")

        user = self.model(
            email=self.normalize_email(email)
        )
        user.full_name = full_name
        user.set_password(password)  # change password to hash
        user.profile_picture = profile_picture
        user.admin = is_admin
        user.staff = is_staff
        user.active = is_active
        user.save(using=self._db)
        return user
        
    def create_superuser(self, email, full_name, profile_picture, password=None, **extra_fields):
        if not email:
            raise ValueError("User must have an email")
        if not password:
            raise ValueError("User must have a password")
        if not full_name:
            raise ValueError("User must have a full name")

        user = self.model(
            email=self.normalize_email(email)
        )
        user.full_name = full_name
        user.set_password(password)
        user.profile_picture = profile_picture
        user.admin = True
        user.staff = True
        user.active = True
        user.save(using=self._db)
        return user

Good Luck!