Is this ptosis, skin laxity or volume loss? (Photo)

You do not have ptosis. Your eye do not match. However, most if not all people have differences between both side of their face. The reason that your face does not match is that your bones are different on each side. There is nothing that can be done to make them booth match perfectly. Botox may help correct the mismatch. Botox@ is temporary so if it isn't corrected. It will return to normal in 3 or 4 months.