From your name and your user name, I suspect that you are closer to
the organization that uses the picture than most of us.
Have you tried to contact Verein St. Elisabeth or the webmaster and
asked about the picture?
Hmm, maybe you're so close that that is why you are asking.
My immediate impression of the picture is that it is American, from
the 1940s or 1950s. This is based on the overall style and the
idealized young lady with her rather loose hair, typical of the
period, also on pictures of nurses. I think a European illustrator
would have had the cap contain the hair, which is more realistic.
Here are some illustrations from the period:
I doubt that the picture is by that artist, Haddon Hubbard Sundblom,
who, by the way, painted the Coca Cola Santa Claus, and later some
nice pinups, including a Playboy December issue cover.
I believe the painting was intended as an illustration, perhaps for a
medical or nursing publication. Obviously, I tried unsuccessfully to
find it, also to find an image of the nurse's pin.
I hope someone else can help you further.
This is a free comment, not an "answer" to your question, which only a
G-A Researcher with a blue name can post.
AND: you should know that the email notification service is defunct,
so you will have to check yourself to see if anything else is posted.
Good luck, Myoarin