Sorry for replying so late.
Try adding some "watery stuffs" or anything that's seen in underwaters such as corals, seaweed, tiny fishes, bubbles and even pearls. The fishes should be hanged by strings/ thing things or any material that is somewhat invinsible. My idea is the quotes should be hang in the fishbowl by a tiny boat above it. The tiny boat is like standing for support since we cant put real water. So we use like a stick being painted just like the background of the bowl. Put a bit of sand in the bottom too or any good material that caa be place underground.