After 12 Trays of Invisalign My Lower Teeth Still Seem Crooked, But I Need a Second Opinion. (photo)

It is very common to need some "tweaking or fine tuning" to complete an invisalign case.  From your photos your teeth look very good so I am not sure if you can have more improvement.  I would talk to your dentist and get his/her opinion. 

It is not unusual after an initial set of aligners to have some teeth that are not ideally aligned, similarly to your front teeth. This is the roll of refinement in the invisalign process. The orthodontist would take new impressions and create additional aligners to perfect toe position of the teeth   Good luck with your treatment

Great photos. From the look on the pictures, they seem to be aligned quite well. I'm not sure you can do any better. Your dentist could give you a better idea based on a 3-dimensional view of the teeth.

Your teeth look pretty straight. The second tooth on the right side could be rotated a bit more. Try flossing your teeth to see in the contacts are tight. If so, you may need further treatment with a refinement. Check with your treating dentist.  Best of luck.

If you did an invisalighn full case, then you are entitled to a refinement.  That is where they take the impressions where you are now and start from that point.  There can be many reasons for the teeth not track as projected by the computer, but a new set of aligners should get you on track.  Good Luck

It is not unusual to need some "fine tuning" to complete a case.  However, from what I can tell from your photo, your teeth look very good.  It is possible that this is as good as it gets, and perfection should not be a goal.