This is a great picture, but the only thing I noticed is that Sonya is the only one without any sort of make-up on. I don't know if that was intentional, but I just realized that.
It's nice to see something new that isn't based on renders for a change. It would have been funny if you'd have drawn two Kisses of Doom for both Kitana and Sonya. Overall it's decent for a fast drawing. Not much complaints, you forgot to color Tanya's hair from the end, that's for sure.