Robots - Machine Arms

Various Robots from my Machine Arms concept art book for my final illustration assignment.
I created a world that I wasn't sure what to do with, whether it would be a game or a comic series. I would love to revisit the characters and add more to them, make them more unique and have more character and really solidify a direction to take them all.
Every story needs an army of evil and background characters, these are some designs for my army of evil and just random background characters. Humans would be scarcely seen in this setting so I figured robots were the way forward.