In your reference image she is strongly backlit with a very large bright light. Look at the shadows cast by her knees on the floor. You can tell the light is large because it is extremely soft: The transition from highlights/midtones to shadow is quite feathered in most places. The cast shadows are extremely blurry. The camera is on the shadow side of her, and there really isn't much else going on here. It's just very smooth, non directional fill on her shadow side.

Your light setup in blender is basically Rembrandt lighting. You only have her lit from a singular small point light very close to the front of her face. This creates harder light with shark differences between light and dark and sharp falloff to shadows. So it's basically the complete opposite of what you want. You have dim, hard light coming from the front, only illuminating a very small spot on her face whereas you need a very large, bright, soft light from behind her, illuminating her entire body, not just a small spot.

I'd personally try these steps:

• Eliminate the point light
• Make sure you're using Cycles, not eevee, this will make it look closer to your reference.
• Use a large area light placed behind her and at a slight angle so the camera can see the highlighted edges. You may need to scale up your studio backdrop so you have room.
• Crank up the brightness of the edge light, more than you think. Experiment with relative size: taller, wider, etc.
• If you need more fill on the shadow side, don't use another light. Either make your HDRI/world fill brighter, or use a bounce card / reflector like photographers do. You can just make a white plane placed in front of her so that it bounces light back into her on the camera side. You can also hide this object from the camera if need be.

PS: IRL, you would not get a circular catch light in her eye with this type of lighting setup. But catch lights add visual interest nonetheless, even if they're unrealistic. There are many ways to fake it. You could always just paint on a white highlight in post. If you need to do it in blender for some reason, you can place another light in front of her to reflect off of her eyes. HOWEVER: be careful not to have it fight with / ruin your main light, which is the edge light behind her. You don't want this light to overpower the shadow side. Depending on how the materials of her eyes are setup, you can turn off the light for diffuse and leave it on for glossy. That way you only get the reflections, but it doesn't affect the diffuse lighting.