Add scratches to the bottom of the kids shoes and the bottom of the bots feet. Like deterioration⦠add some dirt, to the texture and some bumps to that area in particular.
Also, most machines like these are considered primitives machines, like ASIMO the robot from Honda⦠I mean, add some sort of serial name to it⦠in the texture like X2 - 9 some sort of robotic name⦠as part of the model āseriesā etcā¦
Just my 2 cents ok⦠Great job and continue the good work.
PS: Adding a female-bot to the composition will add a stronger feeling, in my case I would design her like on her knees in front of the little-bot (the red one)