To list it’s armaments from right arm to left; It has a Rail gun arm, a tank turret on top, a chin mounted turret, and some sort of short ranged plasma cannon on its outer left arm, which also has a power claw. 

The protruding narrow grey head could house very long lenses for sniping. Redundant cameras would be located on the turret, railgun scope, and the front shoulder plates.

This was drawn from imagination and memory as a stress free sketch, but I liked it enough to finish it with colored pencil and digital enhancing through Picsart app.