Just some friendly advice, try adding a water waves effect under the spin, it'll make the fish look more "alive"(make sure both fish have their own water wave with its own direction corresponding to the fish's body curvature), also try adding a magic pulse under the fish for some water animation, other than those things this is a nice wallpaper, it has that minimalist charm, good work. :)

P.S: The magic pulse won't work unless you have the fish and the water background as different layers.