Learntarot.com says:

The Two of Swords is about the barriers we put up between ourselves and others and those we create within ourselves. Internally, we block off emotions and refuse to feel them. We avoid looking at the truth and pretend that everything's OK. We think one way, but feel another. In countless ways, we divide off parts of ourselves and try to maintain them even when we know they need to be reconciled.

As she goes on, she refers specifically to the image on the Rider Waite deck, as does Rachel Pollack:

. . . First of all, the crossed arms close off her heart. The imagery of blocked emotions continues in the way the grey dress seems to merge into the stone seat. At the same time the heavy swords raise the centre of gravity from the solar plexus to the chest. . . .

I've chosen to use the Da Vinci deck as my primary deck because that seems to be the one that feels the most comfortable to me--I like the images on the Rider deck, but I think I need to go handle a few of them, look at the different versions, to decide whether I want to buy one or not. I thought I would like the Universal Waite deck, but once I had it in my hands, I didn't like it--the images were too bright and cartoony.

But obviously most of the resources are going to be using this deck, and the symbolism on these particular cards is a big part of it. I need to think about this one.