Trying to find out which movie from approximately the 1990s contained this plot: A woman sees a beast murder a man in an alley or street near her home. She is terrified and promises the beast if he lets her live she will never tell anyone about seeing the beast. Then the movie switches from "scary" to "romantic" as she meets the man of her dreams and hooks up with him. It appears to be a "they lived happily ever after" but she has disturbing dreams of the murder and is an artist. She draws or sketches the beast from the alley. Eventually she tells her hubby what she promised not to tell and he turns into the beast to destroy her. Can't remember fully but the beast might have possibly fallen from the sky (crashing like a meteor or alien landing in the opening scene).
This could be the final segment of the Tales From the Darkside movie;
Lover's Vow : A despondent artist named Preston (played by James Remar) witnesses a gruesome murder committed by a gargoyle-like monster. The monster agrees to spare Preston's life as long as he swears never to speak of what he saw and heard or describe the monster's appearance to anyone. The monster vanishes, leaving Preston traumatized and confused, but bound by his oath never to talk about the incident.
After that night, Preston's life takes many turns for the better. He meets a beautiful woman named Carola (played by Rae Dawn Chong), and they fall in love, marry, and have two children. Preston's struggling art career becomes wildly successful, and life seems promising, but he is tormented by memories of his encounter with the monster, and his vow of silence weighs on him. One night he breaks down and tells Carola about the monster, even showing her a statue he sculpted of it. She appears upset; at first Preston assumes she thinks he's lying, but then she lets out a heartbroken screech and reveals herself to be the very same creature he met that night.
Admittedly it's a male artist, not a female one but everything else in the story fits exactly.
Warning : Video contains NSFW content (Creature effects)