Unfortunately I can't include pictures uploaded elsewhere in my posts yet, so I'll just tell you that smiling that "ear to ear" smilling is extremely uncomfortable for me.
My parents always complain that I never smile in pictures, but in all honesty, my facial expressions always tend to lean towards the neutral, regardless of emotion. So when I do smile intensely, I often can't ever find the right look. It's either too flat for everyone else or too goofy for me. (I use the word "cheesy")
As for taking my own picture, I must either use a mirror and take a picture of my reflection or use the front camera on my tablet. I need be able to see myself or else the photo turns out horribly. (Not that the image resolution on a front camera will ever be that good.)
P.S.
I'm not sure if I actually have ASD; I suspect it to an extent, but I just can't be sure.