i like it. could it be possible to see a wire?
I think you shoudl make the blade a little sharper.
Do you know how to use soften/harden edges? I found that works Excellent on making bladed weapons. Its under Edit poly>Normals>Soften/Harden. Select an edge and try it out.
And you should look around for a metel shader. The knife looks plastic. But i like the design.