If you click into the Photographer Name field on each photo you can add the photographer for each photo. If you do not do this for any of the photos it is assumed that the hunter is the photographer. As soon as you have multiple photographers involved in the one artwork you really need to label every photograph with the correct photographer.
You can also, optionally use the Photographer tag in Advanced Details where you can also specify multiple photographers. The advantage to using the tag is that photographer name is then searchable.