I found this gorgeous harry potter + starry night painting on tumblr. I tried to find a picture of this taken without a flash, and I was unable to, but my attempts led me to a nice surprise. Apparently multiple artists have had this idea. Check out the other Hogwarts Starry Nights that I found.
“Starry Night Over Hogwarts” done in colored pencil by Deviantart user Rotae.
“Hogwarts, A Dark and Starry Night” acrylic painting done by Deviantart user m4g1c4lm3