I've forgot how to cut a face and merge onto another person

[kenny1999]

        Hello Rich2005

Maybe you can try it out. I am doing this two picture with your suggested plugin earlier

I am merging the face of picture 1 to the picture 2.jpg

It just... how to say... the result is quite strange...maybe you 
can test it out.

I am doing this for fun and joke and I don't mind the face being known to be merged, 

but the plugin looks like ..making it like it's not manipulated and I cannot recognize the
face of the original person in the result