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The problem with low light photography is that often we choose wide open apertures and then the DOF is so narrow that things we want in focus just aren't.
Example: #1, her hand is in focus and her face is not. So how to avoid this? Arrange for the candle and her face to be the same distance from the camera and focus on the face (or candle).
Another thing you can watch for is your crops. In #1 we see half a shoe, rather than no shoe or the whole shoe. There was room to "aim lower" to include the shoe(s) or you also could have cropped above the shoe.
The last shot would be my pick of the set.