As director of the McDougall Center for Photojournalism Studies and caretaker of his body of work, I'm sure it's fine for you to use the photograph in this way. Would you please credit Mac, though - if it's possible this credit would be ideal: Photograph by Angus McDougall/Used with permission from the McDougall Center for Photojournalism Studies (email from David L. Rees)
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.