There was a large family of Slaydons headed by William Justice Slaydon, called Silver Bill, who lived on the TX/LA border, and your photo almost certainly is a descendant.
Part of the family lived in DeRidder and Sanger, and Archie Slaydon wrote several detailed accounts on the family for a History of Newton co TX called "Glimpses of Newton." One of this family married into the notorious McGee clan.
Please contact me at firstname.lastname@example.org. I have several descendants of these lines on my website who would be very interested in this.