<img class="alignleft size-medium wp-image-112375" alt="Silurian" src="http://eoghann.com/wp-content/uploads/2014/03/Silurian-400x600.jpg" width="400" height="600" />
The Silurians first appeared in Doctor Who back in 1972 in a face off with the Third Doctor. They came back a couple of times in Classic Who before their appearance against the 11th Doctor, for which they got a pretty major redesign.
And it's that redesign that this cosplay is based on. It's a pretty impressive recreation too. the face makeup alone is very complex.
You can see more photos at the link.