Its not easy as you all know to smile at a computer or camera! You have to imagineer the funniest thing that it could do!
Apart from that I used a texture to confuse the shot as to the lines on my face and the lines on the texture:
A good thing:
Spent all day - deleted 100s of 1000's files on one computer and backing up another which took at least 3 hours!
I feel your pain both with trying to get a genuine smile and how to deal with the wrinkles I don't see but the camera picks up perfectly! ♥ You have managed to accomplish both with this selfie!
And also good to clear files. I've tried to do the same....still to finish.