You have light sources coming from the left, the top left, and the top. It makes the piece seem ununified.
The pole and the button are both too big and bright compared to dinko, who is small, dark, and desaturated, it makes it look like dinko is waaay far back in the shadows and the pole is really close up.
Everything has a shape, not just the arm. you should study your arm and see where the bulges are, the biceps, the deltiods, the triceps.
Then look at the legs, your knee stands out a lot, and your leg is like a cylinder except the base is a oval, not a circle. The lower leg usually has a prominent calf muscle, making a bulge there.
The fingers are shaded such that they look like they have outlines, disconnecting them from the hands. This can make them look like sausages. (YUM!
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