Why have my eyes changed shape? (Photos)

You have lost some fat/volume in your upper eyelids and brows. You would benefit from filler (or fat) injection in upper eyelids and brows. See following link and video. See an oculoplastic specialist.

thank you for posting your question. Comparing your pictures you can see a greater distance between the upper eyelid crease and your eyebrows, giving you a more "surprised" perception.This might be caused either by actively raising your eyebrows when the picture was taking, or this can also be the result of Botox injection in that area or surgery performed.I hope this  helps.Kind regardsBianca Knoll

It is difficult based on the photos provided to clearly answer your question.  See an eyelid specialist for an in-person consultation and comprehensive examination to best communicate your concerns.  Best wishes

Your eyebrows are elevated in the lower photo which is opening up the orbit or the appearance of her upper eyelids.  This can be simply a muscle phenomena caused by using lifting the eyebrows and looking surprise or can also occur following Botox treatment.