I think the pose is very bland. I mean, even if it IS break-time, and he IS standing around the like the government worker he is (and like government workers do

), it doesn't mean he's got to have such a rigid stance. There's plenty of more interesting stances that still show boredom effectively. If it were my piece, I'd have the shovel between his legs, both of his hands resting on the handle with elbows out, and his chin resting all its weight on his hands.
Also, I'd emphasize the chubby-ness a bit more...maybe his shirt isn't quite big enough?
Apart from the anatomy issues (of which I really couldn't help with) I guess I have nothing else to offer right now. Stance; and expression.
Hope that leads you somewhere. Good luck.
Btw:Reminds me of Kon's '
Treasure Hunter'