I'm afraid you would need to ask Kazu (Milkienut), the artist.
https://twitter.com/MILKIENUT
If you just want a picture of evil David in-game, you could take a screenshot. There are playthroughs on youtube, you can just pause the video, toggle fullscreen and take a screenshot. But I don't think it would be appropiate to share the individual David portrait without consulting Kazu first, since they created the art