Yeah You are right. In short, Sara not looking well at all. The Caroline look maybe different because I don't use any makeup (on beach? and water?) and of course maybe the fault is the pose and a point of view
I will admit Sara's gotta be a tough one, because of those freckles and eyes, so I took a closer look at your renders . This advice is for anyone trying to make their Sara a bit more like one in the game, which I find is the best but others have gotten theirs pretty close and even impressive alternative versions.
I notice in the game Sara's hair is always behind her neck rather than on her shoulders, so that was a big one that kept throwing me off. Also you need to work on lighting, especially with her hair, skin, and very importantly her eyes colors and lip shade, depending on brightness of scene and making sure they go well together in a very pleasing way.
Icstor in general has a very artistic talent in regards to the facial expressions and poses for all his characters, something I think we can all try and work on. it even affects things like shoulders and postures when more relaxed but also to make a character more sexy naturally while keeping it simple.
I decided to upload a few examples of Sara from the game here, so you can notice the lighting and facial poses, there's a trend and especially the brightness of those green eyes vary based on lighting, even though I excluded the night scenes.