Here are some details from Hoffine's blog:
With limited time and budget, I chose to focus on the moment in the story when Pickman brings Thurber, the narrator, into his underground studio to show him his Masterpiece – his greatest and worst work – the one that can never be shown in public.Just...wow. Joshua, I hope Great Cthulhu devours you last when he awakens from his sunken tomb. You've earned it. There are a bunch more photos on Hoffine's site so head over there and start ogling them.
Instead of creating one heroic image, I wanted to create a sequence of images as if they were shots from a scene in an old Hammer movie.
Also, you can read "Pickman's Model" online for free at Dagonbytes.