You can definitely paint, for someone just starting in game art. How long have you been drawing or practicing other traditional medium? :) The chunks/dents hint concrete in the blade to me.
I agree with Arkana, if you are wanting to make your blade more metallic looking you need to create a bigger contrast between the darker base metal tones and the sharper edge highlights, don't spread out your painted specular to wide. Also the other thing that will help sell it as metal is if you have a light direction…