A little bit of Chinese flower pattern will be a great decision.

japanese sword - how to make a samurai 



sword

Layer overall opacity must be set to about 25% - 30%.

japanese sword - how to make a samurai 



sword



japanese sword - how to make a samurai 



sword

Next step will be the making of the blade. I want to flip a trick here. I've flattened all the layers made a copy of my background layer and cut the one of the layers in 2 pieces. Make a cut just where that blade should begin. So if you got me right you should have only 3 layers now. Here is some a screen shot of my layer box.

japanese sword - how to make a samurai 



sword

Make your canvas just a little bit wider on the left and just transform the blade" layer to the left too.

japanese sword - how to make a samurai 



sword



japanese sword - how to make a samurai 



sword

Make a selection. In this stage you should get a reference for the blade. You have to know how the lights go and the shading itself.

Make a new layer
  
just now (the area must be selected). Overlay the area with white to transparency layer from up to down.

japanese sword - how to make a samurai 



sword

Add some plates to the edges of the sword. You can make it with a brush or just selecting and filling the selected areas with some color.

japanese sword - how to make a samurai 



sword

The next and the final step will be the creating of that metal thing that basically holds the blade in tanto swords.

Create a new document or just a new layer on your working document.

So here is the explanation of the stuff I used on this thing.

japanese sword - how to make a samurai 



sword

As you see - especially if you are working on the TFT display if the sword itself is nor separated from background for good. So create a new layer choose black to transparency layer and just get rid of the background bugs just separating the sword using blacks.

japanese sword - how to make a samurai 



sword



japanese sword - how to make a samurai 



sword

And this is it on making a tanto sword in Photoshop.

japanese sword - how to make a samurai 



sword