He sure is pretty! ❤ He should be crowing soon. Do you have any other cockerels or adult roosters? Just keep an eye out for any odd behavior, dilated pupils are not normal, definitely post in the ER if he starts to decline.
Yes his pupil does look dilated. Is he walking ok? Eating, drinking, crowing ok? If he starts to act off, you might start a thread in our Emergency forum for more help. https://www.backyardchickens.com/forums/emergencies-diseases-injuries-and-cures.10/