Hi Gary,
I have a few Stewarts in my tree, one, Bryce Stewart 1891-1927 b: Ayr, d: Stirling, married Margaret Young in Ardrie in 1907. My main line is the Young's.
His parents came from Northumberland, though they all seemed to move to Scotland in the late 1880's, all were Basket Makers, Tin Smiths, Hawkers etc.
The earliest Stewart I have is Bryce's Grandfather William Stewart b: abt 1827 in Scotland, so it looks like they moved down from Scotland in the 1850's (all William's children born in Northumberland).
If these connect with any of yours I can give you birth dates, places etc if you need them, though most of this info is from census returns I do have a few birth, marriage and death cert's.
I don't have any photo's I'm afraid, but I'm sure someone on this site will, they are so helpful.
Yours Jane