Frank,
I love the movement and the extra person! This is more complex but did you alter your lighting? How did you do this? Picture # 3 seems most active.
Almost always, I have little criticisms of significance to your lighting. Here too. However, I do feel some additional work could be valuable here. Darkness over the body needs modulating somewhat!
One special feature of Tango dancing is the shape of the legs and thighs are so well seen as the body moves against the thin dress fabric. If this is not represented in the delivered image, we short change the picture and the tango feeling itself. So, unusually, the dress might benefit from work with selective dodge and burn or better, a brighter layer with highly selective masking to bring out the body and thighs. If this is not utterly sensuous, then it's not tango!
Thanks for sharing such an attractive pair!
Well done,
Asher