Are you after references to 3d or a 3d image itself. These samurai I have drawn are wearing 3d glasses, is this not the direction you wish to head? Providing individual feedback will help greatly in achieving your desired logo.
I'm after 3D references but I think the glasses are too subtle - although i DO appreciate the detail and it is creative/cool idea i think there are ways of playing with the 3D nature of our company that could pop more. I like the font a lot with entry 12 but the head looks too threatening. I think full body images are more effective. OR just using symbols and imagery rather than showing a whole samurai - but the floating head is eerie