You asked for constructive criticism, I'll try to help you with the "credibility" of the livery sponsor-wise.
Some of the sponsors are not consistent with how they would do in real life.
If you fix these, you may have a much more "believable" fantasy livery that would fit as if Saab was really in F1.
-Saab would not be allowed to use the official "F1" logo in their logo, let alone the "old" version of it. You can try to invent a "Saab F1" logo using Saab's official font.
-Marlboro is obviously not an allowed sponsor in F1 anymore. An alternative would be to use Mission Winnow. Also, they wouldn't accept a sticker on a small deflector, usually they want the big space on the engine cover. Try looking at how they did it on the Ferraris !
-Total, Mobil and Shell can't be together on the same car, since they are competing companies. You can choose either of them but as far as I remember, Saab were partenered with Shell rather than Total or Mobil. Also, if you want to choose Total, remember they changed name to TotalEnergies as well as logo in early 2021.
-The Saab griffon logo should not be inclined on the sides of the car.
-The Saab griffon logo should not be alone on the nose of the car, company guidelines ask for the "Saab" name to be put along.
-Vodafone would probably ask for more spaces on the car. For example, the wings, and usually ask for red on those spaces.
-FOM rules mandate the constructors put a logo on the tip of the nose of the car.
And probably a few more small issues, but it's really nice to see you're starting a Saab team, one of my favourite brands !
Thanks and good luck on improving your cars !