What are my options to straighten lateral incisor tooth? (photos)

Invisalign is the only treatment that I would recommend for you.  It would be an easy case and give you a great result. Best of luck.  

Hi, and thank you for your question. After looking at your pictures, it is my professional opinion that you have two options to correct the position of your lateral incisor. The first, and best, would be to undergo some sort of limited orthodontic treatment, either Invisalign or traditional braces. That will move the position of not only the tooth in the mouth, but the root in the bone, placing it into the proper position for long term health and success. It will also avoid trimming down your tooth. 
Your second option is to have the tooth trimmed down for a veneer or crown. It will be instant gratification, as it can be done either in one visit (as I do with CEREC) or two (traditional impressions and lab), as opposed to orthodontics that will take months. The downside is that depending on how far the tooth is flared out, you may hit the nerve in the tooth when trimming to allow proper placement of porcelain, and that would mean you would need a root canal. 
Overall, I would recommend you go with orthodontics as your first choice.
Best of luck,
-Dr. Alvarez