it does look proportionately weird. I did a junky retouch on it without really getting too in depth with fixing its texture and coloring. I modified some parts to give you a better understanding on how to give it some form and character



I wanted to make the right arm angled more instead of looking weird and flat. I want to make the robot look like he is slightly turned, as you were depicting, as well, so I modified some of the lighting and shapes like on the breast plate, arm, and shoulder of the right side.

The legs were truly bizarre, looking like scrawing bird legs, which is ordinarily an unattractive machine design, so I gave it some better weight and volume in the torso and legs.

For the right side of the body, I noticed you didn't seem to give any shine to the left breast plate (well, barely), when in reality metal catches every lightwave and you would definitely see it. Moreover, the head does not cast a black river on things realistically, especially since the breast plate is curved. So, I shaded the left breast plate (again, this is a rough edit) as a curved piece of metal in that placement/lighting would reflect, then the head casts a slight darkening rather than a pure dark shadow river.

The head was slightly too direct looking so I made it look angled, again, as well with the rest of the  body. In the eye I noticed that you shaded the right side of it, since the lightsource is on the right, depicting the eye going in a little. However, I felt that since it was against the black, which is VERY dark, it actually ended up looking like a highlight coming from the left side. So, I turned it around so that it looks like that light on the right slightly illuminated the inside of the beveled eye. No it may not be entirely realistic  but it's something that needs addressed.