IPR gap still there after refinement period. Any suggestions? (photos)

You should discuss with your Invisalign provider, and tell him of your dissatisfaction with the current result.  He should be able to provide additional aligners to correct this problem.  Your lateral incisor appears to be long and narrow,maybe due to overzealous IPR.   Another quick fix option would be to have some cosmetic bonding, as this is often done after Invisalign or Orthodontics to finalize a case.  There may be a small fee, but your Invisalign provider(orthodontist or general dentist) may be willing to do this for you for free to complete the case to your satisfaction.  There is a new system called EasySmile Veneers which was developed by Dr. Harvey Silverman, a cosmetic dentist from the Cleveland area.  It is based on an advanced resin technology that allows for a strong and stain resistant, natural looking veneer to be created in 1 short 15 minute visit without any filing down of your tooth, so you get to keep all of your natural healty tooth structure.  He developed this system to correct flaws in 1 or two teeth in person's smile, and this could be an ideal way to finish your case.  The space would be closed and your tooth would look completely natural.  An EasySmile dentist can create a Preview Veneer so you can see if you like the result before proceeding with the treatment.  If I had done your Invisalign, I would offer this service to you for free, if you preferred this to  wearing additional aligners.  You local dentist can receive training from Dr. Silverman via a webinar if he would like to be able to offer this treatment. You can google Dr. Harvey Silverman or EasySmile Veneers to learn more about this new cosmetic system.  

I hope that your case was performed by an orthodontist, rather then a regular dentist. In any event, return to whomever did your work, voice your dissatisfaction and ask him to request additional aligners. Don't stop until all spaces are completely closed