How much reading have you done on the theories of composition, beyond the RoT's?
I have done quite a bit which is why I pointed out especially in the first one that she was facing forward, but I like capturing expressions with babies trying to crawl off my studio.
Composition has little to do with how she is facing, moreover, posing.
Composition has to do with placement of your subject within the frame, and how other elements of composition and design effect how the image is viewed. (which way the subject is looking can have a great deal of impact on how you decide to compose)
In your first image, you should have put more space above her, and shot in portrait orientation.
This is a good example where centering the subject would work. Trying to apply the rule of thirds here is just a waste. It's awkward.
The bigger issue, going back to the space above her, is what the effect of that lack of space, and the more generous space below her imply, or suggest. It suggests she is floating. Providing more space above, and less below helps ground the subject. In that one her pose is a triangle shape. Bottom heavy. So, visually, you want the bottom heavy subject to be grounded. The converse is true if you have a subject that is floating or flying. Some will suggest leaving more space above and in the direction of implied movement. Sometimes that works. Other times, it's very effective to put the floating/flying subject higher up, and near the edge, to add to the drama of floating away.
I think you need to do some more indepth reading, and really studying composition. Supplement this by looking and well done images, advertising, even TV and movies. Movies are great to watch and apply compositional theory to the scenes, and watch as they transition from one composition to another. All your images are framed rather awkwardly. Even if your lighting was spot on, the images would still be lacking.
On the second one, as you know, you chopped limbs. Portrait orientation would have let you capture all of her. Mind you it's OK to chop body parts when it works for the composition. Typically, when you are close up. But it takes a real good eye to figure out where to crop in the most effective manner. There are no set rules for this, and it takes time to get a real good feel for doing so.
The third one would have worked so much better if you put the rubber ducks more to the right of the tub, and in the same plane. It would have allowed a nice landscape portrait, with balance and a reason for the space on the right. But the direction of her eyes in that composition wouldn't work too terribly well. She would be looking out of the frame on the left, and that directs the viewers gaze in that direction as well. As it is now, again, should have been shot in portrait. It would still have issues, but it would be better. This one also has the bullk of the subject higher in the frame, little space above, and more below, giving the feeling of floating. You have to think of the final product when setting up your props to get the most effective compositions out of it. Otherwise, you are stuck.
The last one is the better of the bunch, and I think a square crop would be ideal here. I'd crop the left, allowing about the same space as her foot has to the bottom edge, and whatever off as needed from the right to make a square.
As much as lighting can make or break an image, composition will do it too.