"Avoid incorporating features or elements that are not consistent with the Carboniferous-Permian period or the Holocephali family. Stay true to the characteristics of small fish species, particularly the angelfish-like qualities specified. Steer clear of unrealistic colors, patterns, or proportions that would compromise the photorealistic nature of the image. Exclude any modern or contemporary elements that may detract from the overall visual authenticity. Strive for accuracy and realism, capturing the side view perspective and presenting the Holocephali with fidelity to the prehistoric era."