That painting is "The Jacobite" by current artist Robert Griffing:
http://www.lordnelsons.com/gallery/f...riffing/40.htm

The problem with it is something all too common amongst reenactors of that period: combining a poor clansman's clothes (only a shirt and a belted plaid) with a clan gentleman's weapons (fine broadsword, elegant fowling piece). A highlander able to afford such weaponry would not be running around in his shirtsleeves! A waistcoat and coat would be in evidence with a fighting man of this class: