She looks exactly like her because she is her (although to be fair she did a good job of looking like Liz before she was Liz...lol).
Irrational games hired her after they saw her first set of Elizabeth cosplay pictures. They used her face for the box art and for the key art. If you don't believe me check this post out on the Irrational games' site: [link]
Man, Ormeli did a phenomenal job with these! The cosplay is great, lighting/atmosphere is spot on, and the setting is cool. Keep up with the good work!