This is a "generic Dromaeosaur" as it is not modeled after any specific species, nor is it even slightly trying to be scientifically accurate. That said, DINOBIRD AND FEATHERS.
The resin blank that this is based on was sculpted and created by Kierstin - http://kierstinlapatka.tumblr.com/ Don't miss out on looking at her work, because her beautiful sculpting job is the star of the show here!
I then painted it, sculpted and set teeth into it, painted acrylic half-spheres and set them for eyes, added faux fur, and feathers. This is a fully functional mask, and the wearer can see (quite well!) out of holes in front of the eyes. The jaw is articulated and fluidly moves with the wearer's own jaw movements.
The colors and patterns were inspired by 1) Golden-Crowned Kinglets, and 2) This old art I made, http://nambroth.deviantart.com/art/Dromaeosaur-Ferns-166320439 and, 3) I had this really cool faux fur that I really, really wanted to use...
More photos on my Tumblr: http://nambroth.tumblr.com/post/90584914322/raptor-mask-this-is-a-generic-dromaeosaur-as-it
Her expression changes drastically depending on the angle that she looks at you from. Sometimes she looks doofy and happy, and sometimes she looks .. well, predatory.