NOT too bad for early efforts, Joy! I'm not exactly sure what you mean by 'something missing'. The way these are lighted is fairly straightforward. I see a lot of noise reduction has been applied, or perhaps clarity has been reduced in post; the skin looks very smoothed, and detail is somewhat low when the images are viewed full-sized. In shot #1, I think the umbrella might be a bit too much "straight on", which has caused it to light her entire face pretty much equally, with not a lot of shaping from shadows. The lighting is somewhat "broad lighting", which comes in and rakes across the face in the broader orientation of the face to the camera. That makes her face look a bit wider than it might really look in reality.
The second shot shows some of the edges of the umbrella's beam; notice how here knees to her feet are much more dimly-lighted? In this case I think that works, to sublimate everything except her face and torso. Umbrellas typically put out a brighter center spot, with lower-brightness edges. The umbrella can be aimed full-force,and directly AT THE FACE, as in shot #1, where pretty much everything in the frame is of equal brightness, or close to it. In shot #1, her face and the pink background are pretty close in brightness. In shot #2, which is a wider-angle view, we can see the softer, dimmer edges of the umbrella's beam, and we can see where the light becomes brighter.
Not sure, as I said, what you think 'is missing', but it might just be more experimentation and practice; these are far from awful. You'll probably find that as you use the umbrella more, you'll start to get a feel for how it throws its light. You might try aiming it so that the softer, edges of the beam light the face, and the hot-spot misses the subject. You can also try lighting the subject from the opposite direction,relative to the way the subject's face is oriented to the camera. Again though, these are pretty good for early efforts! Don't be too hard on yourself.