It's a bit difficult to tell from the photos but it looks like you just have a single screw through the middle of the ear, if this is an ANH stunt you should have three screws, if Hero then two (judging by what I can see for teeth this may be a Hero). Also, again hard to tell from this photo, but it looks as though you could lower those ears slightly which would allow it to wrap around the tube better. You'll also want to work more on those teeth cutouts.
Make sure you take a look through the build threads as well.