Possible laird of Barnbarroch

Can you help with this query about dating?

This is (or was) a painting from my family home, Barnbarroch of an unknown Vans Agnew. Because of the size of the work and it’s important position (in a photo of the room in 1907) I presume it to be of a laird of Barnbarroch and therefore if I could date it precisely I could identify the subject, either an ancestor or uncle of mine.

I’d be immensely grateful for any help and, to be honest, with any opinions as to the age of the sitter too.

Thanks in advance.

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