According to the official Spy x Family FanBook , these were the original looks of the series' main characters. Recently, more sketches were released that show what Loid , Anya , and Yor would look like before the manga's release.

The project was presented to the manga editors who ultimately opted for a change in the look, which is what we know today.
The x Family anime is airing every Saturday and is produced in a collaboration between studio WIT and Cloverworks . The series is scheduled to have 25 episodes divided into two parts and at an interval of 3 months .
Synopsis:
In short, the story of this different family takes place with the spy codenamed “ Twilight ”, where he spent his days on secret missions, all for the dream of a better world. But one day, he receives a particularly difficult new order from command headquarters. For his mission, he must form a temporary family and start a new life?! A spy/action/comedy about a unique family!
Finally, what did you think of the original Spy x Family visuals? Leave your comment on the subject!
Via: Fanbook