Is one eye smaller than the other? (Photo)

Thanks for your question and posting photos. 
One of your upper eyelids may be hanging lower than the other side. It is difficult to tell for sure from the photos. Seeing a plastic surgeon will allow a better exam and to get a diagnosis, if there is one. In addition, the bony structure of your face can be better evaluated for any potential abnormalities. 
Best wishes, 
Rohit Jaiswal, MD   Plastic Surgeon 

In general, it is not uncommon to have one eye that appears "smaller" than the other.  Commonly, the eyes themselves are the same size but the bony eye socket may be different, as one example.  Other causes can be ptosis (toe-sis), which is a lowering of the eyelid margin. Many times the eye with ptosis will be seen in photographs as the eye that is closed (or near closed).  Other causes can be hollowness disparities between the two eyes and even eyebrow shape differences can make the eyes appear different in size.
I hope this helps.
The attached link provides more information.