Easyref - A modeling friendly image reference system for Blender.

I'm using the image reference script authored by Cedric Lepiller, the same guy who created Speedflow and Speedsculpt, it's called Easyref and as he would say in his French accent, "this is nice". What's really unique about this addon is it allows you to put the image right into Blender, overlaying your work-space, you then construct geometry right behind it, it's magical.

Above is the model with Easyref overlayed, and below is the  unfinished model as it is, closely matching the proportions of the reference image.