I am loving the cartoonish style here! Your work seems to have a nice pixelated texture that adds an eye popping effect to your work. The pose is very dynamic and seems to match the energetic expression on the character!

I wonder if you could really push up the dynamic pose more by really exaggerating the line of action? Maybe really push up the wackiness of the pose as the hammer is coming down. I like the bottom hammer impact lines. They make me imagine a sorta loud "POW" sound as the hammer hits the ground.