Why is my right more open than my left eye? (Photo)

It appears you have left upper eyelid ptosis (droopy upper eyelid). See an oculoplastic specialist for evaluation and possible eyelid ptosis surgery.

The size of your eyes can be different for 4 reasons. 1- Facial asymmetry where 1 eye socket is simply smaller than the other  2- ptosis where 1 eyelid is lower due to a stretched eye muscle. 3- 1 eyebrow is lower than the other making the eye itself appear smaller. 4-a different eye crease attachment. 

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  You may have ptosis of the lower eyelid.  This can be corrected with a ptosis repair in the right patient.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon