Of these, I like the first picture. A sweater wihout a tie is relaxed modern wear, so to my untrained eye, sgian dubhs, super polished shoes, studded or dressier sporrans all begin to conflict with the general dishabille (wow, can't believe I just used that word!) Steve's sporran belt really goes nicely with his jacket.

Third picture - I too like the red accent. Sporran might be a bit lower, and he needs something more than a sweater - it's snowing!