What's wrong with her eyes? Is she some crazy maniac alien who's gonna eat MC alive?
Do yourself a favor and don't use camera lights, or lights that come directly from the camera position.
Render with the guy, the scale is off, the colors don't match and the shadows are too harsh, better use some softlights there. Guy looks like he want's to say something, but his mouth is closed.
Second render in the living room misses the hdri background. If it's supposed to be a night scene, just reduce the environment intensity.
Third render in the living room... those eyes... the second girl has the iray bug, have a look in the forum, it's a known issue.
Laste render, when you swap textures, make sure they fit, or use tiling to make them fit.
Make sure your characters and extremities aren't floating above objects, like the elbows in the last one, the hands over the chest in the last livingroom one, the feet over the ground, etc.
You really should have a look at some lighting tutorials.
Looks like you have some good hardware, if you use it properly and stop using only presets you could make a great game (visually).