Whats your lightning set-up? There's a lack of shadows/tints in the picture which makes it seems like a doll.
A very common used lightning set-up you could try out is a 3-point lightning system. I created a quick scheme how they should be set-up. All 3 should be on a 15-45 angle up from your camera (so the light comes from above)
A key light from where the light comes from. This is your main frontal lightning and should be high enough to light up your model.
A fill light at the opposite side of your key light to lightning up the shadows up a bit. This should be half the strength of your key light at most. Around a 1/4th or a 1/5th is more often used
The back light is to give your character a glow from the back, and is often your strongest light. Just increase it till you get a nice glow around your hair.
For the rest there are some minor anatomy adjustments you could make, which might make her look more realistic. Her shoulders are a bit to narrow, the curve from her middle torso to the hips seems a bit to sharp (I would say it should start a bit higher up), and she misses the line between her belly button going up between her breasts (that one might be there but isnt shown because of the lightning issue).
Its a good render overall though. Did you made it from scratch?