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I believe this is a picture of my grandfather, Donald Muir from Glasgow.  He was born in 1875 and I think the photo was taken about 1895 by Hampton photographers in Glasgow.  Although the uniform looks military (Royal Artillery was suggested to me), I don't think Donald was ever in the military.  As far as I know he worked in the Glasgow shipyards all his life and he is there in the 1891 and 1901 censuses.  Perhaps it is a bandsman's uniform or did photographic studios have clothes (and uniforms) for customers to dress up in?   I assume the original was in black and white but that it was coloured later (I remember my uncle, his son, used to do that).
Any help appreciated