As previously mentioned, this icon lacks proper shading and highlights.
The shape of the inner circles is also off.
Use soft shading and create metallic highlights (depending on the metal type either through harsh contrasts or soft shading aswell).
Get rid of the little triangles between each saw tooth - they make this look like an item used for decoration rather than a saw.
Curve the saw teeth to make this piece look actually sharp, dangerous and potentially lethal.​