the first is "better"
IE, more appropriate
but you need to position her head to the teeth look straighter, in the second image they loko fine, in the first image they are crooked..
so choose the subjects "best" side
however, the first looks like it has motion blur too...
so keep that shutterspeed up
i find the second one too close, head and shoulders to me is a bit more natural and doesnt emphasize facial blemishes as much.