My opinion:
Alfa Romeo - Kind of a side step rather than an improvement, but still looks great.
Alpha Tauri - Similar to the Alfa Romeo situation, though I admit I didn't like it at first on the studio pictures. But on track it looks
really great. My 3rd pick.
Alpine - Looks clean and great, I will miss the yellow but this is very pretty as well. My 2nd pick.
Aston Martin - Similar to the Alpine situation, although I will NOT miss the pink. Just a great simple livery, pink line instead of yellow, but it honestly maybe even looks better with the dark pink accent. Hyped for the team and hopefully Vettel will be successful here. My 1st pick.
Ferrari - Disclaimer: I did not like the Mugello 1000 GP livery. This transition into Rosso Mugello at the back of the car could have been executed much better though. It kind of ruins it for me. Green MW logo or not. I am a Ferrari fan, in my opinion this is their worst livery in a long time. But hopefully it's faster this time
Haas - Seems fishy for obvious reasons, although it is not a bad livery per se, it simply does not suit an American team. They have had much better liveries.
McLaren - Great livery, but it did not change really so I didn't want them to be one of my picks.
Mercedes - Despite being "our" (Ferrari fan) main rival I have to admit they have had really good liveries in the previous years, including last year. This time, the fade to silver and AMG AMG AMG AMG AMG AMG AMG AMG AMG AMG AMG AMG ruined it for me. Step in the wrong direction.
Red Bull - Same old, same old. Though, if it ain't broke...
Williams - Again, looked bad on the pictures, looks better on the track. But it's kind of... uninspired in my opinion, not sure if it's the right word. For most teams the livery makes sense for the team, even if it's not the best execution. For Williams, I do not see a connection between the livery and the team. Maybe new beginnings...