Thank you so much! : D
Kazu (Milkienut) is an amazing artist and did an incredible job with David and Iris' art
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
What do you need exactly?
If you just need a picture of David being evil, you should take a look at some of the videos on youtube, specifically the thumbnails. The thumbnail for Manlybadasshero's video is evil David, so you could take a screenshot of that thumbnail (or download the preview thumbnail)