I really like the houndstooth jacket -- great choice that I think is perfectly fitting with any tartan, any color.

Your choice of red hose -- despite the fact that there is no red in the tartan -- and your choosing not to wear a belt, both speak to me of confidence in your Highland dress. Both are perfectly legitimate choices that I think many neophytes would miss because they "go against the grain" of what many people are taught initially.

If I had to pick anything to change, I'd personally go with darker green flashes. Also, I think I'd prefer the sporran worn just a tad higher myself. I tend to wear my sporran higher when I'm not wearing a belt; not quite sure why, but it just "feels" right. :-)