Exclude any depictions of violence, aggression, or negativity in the image. Also, exclude any depictions of human activities, such as boats or fishing nets, and exclude any depiction of polluted water or other forms of environmental degradation. Additionally, exclude any depiction of creatures that could cause fear or anxiety, such as sharks or other predatory animals. The emphasis should be on creating a tranquil and beautiful underwater environment, where all creatures coexist harmoniously.