to take the thread seriously for a second -
1st pic - I can't remember, I think it was an FX artist trying to show how crappy the "Alien Autopsy" was by outdoing it. There's one like that where he has a demonstration of how he made it.
Or, I may be mixing it up with one I saw that was made for a Haunted House.
I like that one a lot. Nice realistic droop.
3rd Pic - It's a dummy at a UFO museum in Roswell, New Mexico.
4th Pic - It's a photoshop a guy did of a picture of his son. I've seen the original picture. Whitley Strieber said, "Well, it...doesn't matter that it's a fake. It's still, by chance, a perfect, exact likeness of the aliens I encountered...so now you know what they look like.
5th and 6th Pic - It's from a Made For TV Movie about Roswell that starred Kyle Machlachlanachlanachlan
8+10 - same, I mean, I think these are all different shots of the one from the movie.
11th - Can't remember exactly but it was going around as an alien that crashed in Russia and was, sadly debunked, 'cause I like that
Glam Pixie-look.
12- Same one from 3rd Pic, imo
13 - same one from 11th pic, imo
14 - That's from the Weekly World News
16 - Same as in 3rd pic
17 - The one in the first pic
21 -That's adorable. I've never seen that cutie before.
22 - Just some art based on Reptilians, can't remember the artist's name
23 - Looks like a clean shot of the "foaming-at-the-mouth" alien that was "interrogated" in the famous "gov't. video that first got big on the Art Bell show.
I've always wanted to see the video, 'cause this alien looks more WICKED than most, but, I can't ever find it.
24 - That's the dehydrated corpse of a bird, or a bird embryo
28 - That's from a sighting of the Dumbass Monster