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 like sardines, minnows, and anchovies while also reflecting the unique attributes of the Holocephali. 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 to create a captivating and believable representation of a small Holocephali from the Carboniferous-Permian period.