Can you recognize a false picture ? Obviously yes, but it’s not easy, how do it? You need much knowledge of art, chemical analysis, advanced technology and good IT tools.
As you may have noticed well verify the authenticity of a painting is not easy, you have to work like detectives to be able to say with certainty if the work subjected analyzed is true or false.
After the first studies, it usually passes to use the x-rays and radioactivity measurement of lead, all this in order to verify the type of substances used and the date to which dates from their appearance.
However, are often used software that recognize the type of canvas, brush, and assess of the position of the signature; Needless to say, if you do not possess the appropriate instruments and does not have a deep art culture, it is virtually impossible to say if a picture is original or not.