What do you find different? The only difference is these two, the game on the left and my own asset on the right is the lighting. The asset is the same. Note the moles etc... on her face for example. You can find my own scene subset of her
here.
You have to take into account the lighting, the position of her body, head etc... her pose. LOTS of variables. In the end, this is just for fan art. If you're looking for perfection, better go bother the dev for his, because that's the only way you're getting it.
In the images below, my pose is a normal face expression. The games has her mouth open, eyes more shut, head tilted down, all of which, when combined with lighting and environment, would give the appearance of being slightly off when it is not
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