It seems as if you're filling in the gaps of where you apparently(from my observation) lack knowledge on proper form and lighting with randomness. You take a shape, but instead of giving it proper form fill it with minor details and other randomness that does not help give it volume but instead simply fills space. For instance a blade is typically one of the easier things to shade because it tends to be a very simple geometric form, just a few flat surfaces that reflect light in a very easy-to-comprehend way(typically dark on one side, bright on the other with some highlights tossed in for good measure). Also when working with metal contrast is very important or else the piece doesn't give the impression that it is shiny and reflective, which without gives the impression of a dull surface, like clay or plastic.
It seems as if you're filling in the gaps of where you apparently(from my observation) lack knowledge on proper form and lighting with randomness. You take a shape, but instead of giving it proper form fill it with minor details and other randomness that does not help give it volume but instead simply fills space. For instance a blade is typically one of the easier things to shade because it tends to be a very simple geometric form, just a few flat surfaces that reflect light in a very easy-to-comprehend way(typically dark on one side, bright on the other with some highlights tossed in for good measure). Also when working with metal contrast is very important or else the piece doesn't give the impression that it is shiny and reflective, which without gives the impression of a dull surface, like clay or plastic.