From certain design elements, you are designing a fighting knife (the notches on the back of the blade)? If realism is your goal, the ribs of the handle are a little extreme. Often a large knife has a guard of some sort between the handle and blade as well and a knob at the back end of the handle. The handle is contoured slightly to help the grip. Frequently, there is a slight curve to the back of the blade toward the point rather than one so extreme.
Here's an example. It's a standard USMC design.
That being said, if your goal is to create an image which people know is a knife...you've done it.