I had a gingival graft and it's been 3 wks and I have a bad smell from the site. Is this normal?

Based on your photo, it appears that you may have some inflammation of your gums starting at the area of your canine tooth and involving your other posterior teeth.  I can't render an opinion on the placement of the veneers relative to the "sub gingival" margin because I would have to see...

From the wear on your lower teeth you look to be a clencher or grinder.  This likely is contributing to your recession.  I would encourage you to get fitted for a nightguard by your dentist and see a periodontist (gum and bone specialist) for an evaluation and minor gingival (gum)...

It is better to have a gum graft regardless of future braces From the pictures, the gum tissue in the areas you have mentioned  look very thin/ receeded100% root coverage will not be possible due to the amount of bone loss between your teeth ( loss of tissue fill between your teeth is...