Alien found in Mona Lisa painting

Paranormal Crucible of Youtube have uploaded a video in which they claim to have found evidence that Da Vinci "hid" an alien in the Mona Lisa. Many people believe that Da Vinci hid a lot of secret codes and subliminal messages in his work which is why this may not be too far fetched.

However many of the comments seem to laugh or make a mockery of the video with one person, Josh Whitbread-Taylor saying ""If we take the famous sculpture David, by Michelangelo, and chisel it down to form a being, we can then see the Michelangelo hid a being inside his sculpture, therefor proves aliens visited earth" -pretty much the logic here."

another user,  TheUnprevented saying "Hmm this is not your normal everyday stupid...this is advanced stupid!!!"

VIDEO: HERE

So, is this real evidence of hidden messages? or just somebody with photoshop and too much time on there hands? Let me know what you think.