I’ll start with the Porsche 997, the 996 looked alright imo, but it looks “like a 90s Porsche”, the 997 made it look sleeker and more modern. Still looks good today.
As for cars that looked worse after a facelift? Maybe the facelifted 6th gen Camaro? The 6th gen looked great pre-facelift, but they did something weird with the headlights and now it looks so-so…
I think the refreshed Tesla Model 3 looks worse than the previous one, and that one wasn’t a winner in the looks department either. The refreshed headlights are too skinny for the potato body, and the brake lights look better on Volvos and Polestars, from which the design was 100% stolen.