There are internet tools which allow you to upload a photo or a URL of an online photo and search for other images which resemble it.
I'm not fully up to speed on how to do this myself and my iPhone browser (Safari) seems to be actively blocking the camera logo in the google search box, which you have to click to get to a menu where you select image upload or tell it the image URL and so on.
With different equipment or a different browser, you may have better success than me.
Buenchico is good with explaining technical stuff but will need to know what computing device and web browser you are using.
Kind of a sledgehammer to crack a nut solution. If you knew what programme or movie that pic was taken from then it would be a doddle to look up the cast list, on
http://www.imdb.com