Good work! ^^
You did a great job on the bots and I really like the other characters too. It's interesting how you managed to give them different facial expressions. Nice!
Too bad that the photos are kinda dark. It reduces the quality of the pic and the colours look less saturated than they actually are. Even worse, cause you did so good on everything else.
But really, that's the only thing I need to criticize.
I also like the setting with the screws and metal parts everywhere around, that's a good idea.