You should try following some shading and AA tutorials. The sword's colors are too harsh, and the shading makes no sense. I gave it a go, and this is what I ended up with.
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I looked up alot of tutorials, trust me, but that is just the way i like to shade my blades. And the reason why the colors are too harsh is that i normally dont use a pallet but its usefull if you want to explain it (: