Why so shy on polygons, it's holding your asset back :). Add some polys! ( You have very big curves, you need a bit more triangles in the cylindrical shapes )
People are saying it could use more polygons, and I agree, but I honestly don't think 99% of players would notice. Players will notice 4- and 6-sided cylinders these days but this level of detail is probably fine, especially if the art direction is strong enough.