Using the dodge tool with a midium size soft brush, and opacity of about 35%, make some subtle highlights to add realism to the metallic blade, use curves again if it gets too light.

Add a drop shadow, and a black stroke with opacity 50 to the layer.

Now we need to make a handle for the knife.
Make a new layer, call it handle, and using the rectangular marquee tool make a selection proportional to the blade size as shown. Fill it with a gradient that gives the cylindrical feel ( I used the "copper" gradient found in Photoshop's default gradients, then used the Hue/Saturation Ctrl+U to make the dark grey color in the next step: Hue=0, Saturation=0, and Lightness= -37, check "colorize")

 
Using the circular marquee tool, delete very small sectors from the handle outline as shown.
Now grab the rectangular marquee tool, make a selection on the part shown in the pic, right click and select layer via copy.
On the new layer, Hit Ctrl+t to resize the layer, then, depressing Alt and Shift, make the layer slightly taller on both sides. Hit enter, then bring up the Hus/Saturation dialogue by hitting Ctrl+u, check "colorize" and darken the layer (I used Hue=0, Saturation=0, Lightness=-25)

Now replicate that layer, move the replica to the left, and repeat untill you have enough of them covering the handle at equal spacing. When done, merge all the new layers with the handle layer.

 

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