The whole 'grey alien' in popular culture has an interesting history.
They first appear, in a way, in the H.G. Wells novel 'War of the Worlds' - 1895. Where they are mentioned briefly as food for the Martian invaders, with only the brief description as being like 'shrunken grey apes'. Wells mentions them again in his 1901 novel 'The First Men On The Moon' in more detail, saying they have "grey skin, big heads, large black eyes and wasp-stings".
HG Wells influence on sci-fi cannot be under estimated, and many themes and concepts that are part of the sci-fi mainstream flowed from his mercurial imagination. His alien and other races (such as the Eloi and the Morlocks from The Time Machine) seam to have provided the templates for what came later. The greys next appear in 1933 in another influential sci-fi novel '
Den okända faran (The Unknown Danger)' by Swedish writer Gabriel Linde.
External Quote:
...the creatures did not resemble any race of humans. They were short, shorter than the average Japanese, and their heads were big and bald, with strong, square foreheads, and very small noses and mouths, and weak chins. What was most extraordinary about them were the eyes – large, dark, gleaming, with a sharp gaze. They wore clothes made of soft grey fabric, and their limbs seemed to be similar to those of humans.
By the early 1960's the 'grey' alien, or beings like them were staples of sci-fi as witnessed by The Mekon from the famous Dan Dare comic strips
In 1965 the world saw the first major alien abduction claim when
Barney and Betty Hill claimed that four years earlier they had been kidnapped by aliens which they described as...
External Quote:
The men stood about five feet to five feet four inches tall, and wore matching blue uniforms, with caps similar to those worn by military cadets. They appeared nearly human, with black hair, dark eyes, prominent noses and bluish lips. Their skin was a greyish colour
This also seams to have boosted the 'grey' alien culture, (although the term grey was still some 20 years in the future), and as more abduction claims were made grey type aliens slowly became the kidnappers of choice, although men in space suits and robots were also popular with claimants.
Note that until now the aliens are like, but not the same as the creatures that these days are referred to as greys. The first classic greys turn up in Spielbergs 1977 flick 'Close Encounters Of The Third Kind', and the reason they look like the way they do is simple to explain. After considering several ideas for the friendly aliens in the film Spielberg settled on using small girls because he felt "girls move more gracefully than boys." and the costume of a grey leotard and a simple mask was chosen for effect, simplicity and for the ease of movement it allowed the child extras.
(info from the bonus features on the DVD)
Needless to say, with Close Encounters being a huge and influential film, this assured the grey alien format as the favourate ET of choice with writers, UFO fans and 'abductees' and they even started working their way into historical ufo lore, for example there is no published claims of grey type aliens in the Roswell mythos until the early 1980's.
However the final boost for the grey aliens and even the name Greys came with Whitley Striebers book
Communion in 1987, where the author describes another abduction case, this time describing aliens almost identical to Spielbergs from 10 years earlier. The book was a best seller, popular with sci-fi fans, who took it as a novel, and UFOlogists, who took it as fact. A blockbuster film followed and the grey was cemented into popular culture.
The result being these days that the 'grey' has become the main image people think of when the term 'alien' is mentioned. Even my own band has a grey type alien mascot character who turns up on all our posters and cd covers.
But the image in the OP is interesting, especially as it dates from 1895, the same year as Wells published War of the Worlds. Wells was a well read man, I wonder if he was influenced by the work, or is it just co-incidence?
Who knows, but its interesting.