I realized I hadn't posted any good Star Wars cosplay in some time so I'm hastily rectifying that terrible situation.
I'm not clear what Mara Jade's status is in Star Wars continuity now that large chunks of the EU have been jettisoned. I guess we find out if she's married to Luke Skywalker when Episode VII comes out.
Either way she's played a substantial role in the EU books despite not being seen in any of the movies or the animated series and this cosplay by Queen Azshara captures the look and attitude very well.
Source: Deviantart - Mara Jade Skywalker