AH, good, just wanted to clarify! Beautiful girl, though!
So, yeah, what the photo shows beautifully is the different kind of "weight" of the "outlines"- or lack thereof- around the features. For example, look at the lower lip of the girl in the photo! The lips are a perfect orientation there, because they show how they have almost no outline, but rather a solid change in color, due to the lighting. The most exciting part there are the lower lips. They almost show solid white from the lighting, while the shadow towards their bottom starts of ever so gently, almost imperceptible, but gradually turns darker as the whole shape curves into the shadow on her right side (the left side of the picture).
In your painting, the shadow has almost the exact same strength from left to right.
You also introduce strong highlights into her upper lip, which confuses the lighting a lot. Try to consider the 3d shapes a bit less like cylinders or balls, but also as flat shapes, you know. If something faces away from the light, it may not catch any highlights.
In your case, it really steals depth and form. Try to take the highlights away from the upper lip and see what happens, see how it feels!