How is this even possible?! The realism contained within this piece is unbelievable! Every bit of detail and texture is so damn realistic that imagining this as a digital drawing is insane, and I'm not talking about the boy or the robot! For a drawing, it looks damned UNBELIEVABLE. The boy and the mech both so detailed and beautifully lighted, the streets and the reflection of light from the wet ground, even the damned buildings themselves can make up as a standalone piece of art, EVERYTHING is so consistent and connected.
I don't know how you did this, or what techniques you've used, but it must've taken a helluva lot of time to complete this, else you're a god. Forgive me for swearing like so, but I cannot contain my awe for such a graceful piece of art like this.