Mary Henderson Cameron's First Photograph Album

Notes on Photograph : 1 - 05
Confidence in Identification ( 80%) &  
Reason(s) for identification / doubts		 Head from 1-05 Head from 1-07

I have a problem with this one. He looks a bit like Alexander Milne, who was 13 years older than Margaret. He must have been over 30 when he married i.e after this was taken. BUT he could have given the photo to Margaret who gave it to Mary at some point ... What do you think?
Plus points - Top half of the left ear. High forehead. Sideburns fit well in beard. Shape of moustache. The bulging lower lip.
Minus points - The eyes. The eyebrows. The shape of the nose.

Photographer Front Back (B & W)
R.Brown, 8 West High Street, Inverurie.
Research - need to find dates photographer was at this address

Description of Photograph
Carte de Visite photograph. Thin white card, square corners. Small trade plate on back, no name on front. 
Description of Subject
Vignette of male with moustache and large sideburns.
Est. Age of Subject Est. Date of Photograph
20s? 1860s

Identity of Subject (Born - Died)
If it is Alexander Milne (1838? - ?), then he was 22 in 1860