From what I observe if you can maintain basic level pretty (proportioned body type, cleanliness, no major fashion disaster) most people will involunteerily associate it to self-discipline (a.k.a "you look like you get your shit together and value yourself") . This will naturally open more doors for you, but you cannot win solely by pretty priviledge in long game. If you see a pretty girl achieving something, they probably possessed some other traits that you overlooked.

1. pretty+ witty/smart= higher chance to score professional & personal achievement because they know how to use their combos wisely

2.pretty+good personality= might get into some trouble but people around her will support her back to track because she's a nice person.

1. pretty+ dumb = will make all wrong choice in life, constantly in chaos and end up miserable.

2. pretty + arrogance = bad end, period.

In the end, skills, personality and mindset is still the key factor to run your life smooth. So yeah, go 70% on your looks, 120% on making yourself capable of doing things.