I'm pretty happy with this render, the only thing I'm not satisfied with is the walking pose of the two in the background, it seems a bit unnatural to me and I'm not been able to fix it
Draw a line down from their head through their torso to the floor.
The only time that one foot is going to be directly under the torso is when the *other* foot is also more or less directly under their torso, albeit lifted in the air and moving forward.
With one foot planted on the ground directly under them, and the other behind them but still touching the ground, it looks less like they're stepping forward and more like they're taking a step *backwards*. Which would be perfectly fine if someone in front of them had kicked in the door and was waving a gun around - stepping back to get in a position to act is sensible. Or if they'd both just gotten the shit kicked out of them, which doesn't make sense for a robot. Now if the robot was a guard and jabbing the other one forward with a gun or cudgel or something....
Anyway, fixing that, moving the foot they're standing on forward a bit, so their legs split their center of gravity will help.
This video -
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- is some experiment about how dots and motion in the right pattern makes it look like a person. Whatever - you're interested in the first segment, Walking. Just watch what the "legs" are doing and where both of them are in relation to the "torso" when one leg is directly under the torso.