I'm inclined to agree with froli's edit on this one. In taka's version it appears that he's pushing on the box with the entire forearm - while in the edit he's pushing with the hand which is a lot more readable in my eyes and packs a bit more energy. With the entire forearm resting on the box, it almost appears like he's leaning against something crying in an emotional fit.
I really do love the style of this whole game, taka. very awesome
EDIT:
even in the reference photos above shows how people effectively push with their hands and not the forearm.