I really love the concept of this piece. I can start to imagine an individual story for each hand represented on this piece. To think what might each story be behind each hand is very cool.

The colour choice is also quite well. It isn't too saturated, the eyes focus on the bright yellow of the axe. The red of the blood doesn't clash too much with the yellow, which has a larger area (although could be a little more desaturated so it doesn't pull the eyes away from the axe too much). The rest of the picture is in brown and grey which ties everything together. Although the handle could be a bit more reddish to pull the focus further to the middle of the page, and a bit more separated from the hands.

The hands are drawn quite well overall, but there's still some anatomy problems. The robot hand fingers especially look off. Pay particular attention to the proportional thickness of each finger on a hand, practice lots!

Overall this a great concept and good execution. Keep up the great work!