I'd always be scared that my fingers would get crushed wearing one of those. It seems like an engineering problem how one would strengthen the individual fingers without crushing them under the weight of whatever it is you'd try to lift.
Nice design, and also very nice artwork. The only thing bothering me about this is that the design doesn't seem to allow much movement of the arm, like touching the shoulder with that hand. But of course one could argue that it's specifically designed for something which doesn't need such function, so I'm really just nitpicking on this.