He didn't paint it, as he doesn't paint any of his stuff. It's only photographs with some digital filters (blurring, sharpening etc., or maybe even some preset make-it-look-like-painting-filter, not sure) applied. You can find the originals on Google. At least he could credit the original artists. This one was done by Tom Munro. That arbitrary texturing makes Johnny Depp look like a wrinkled leather bag in some places. Original photograph vs. manipulated photograph: i.imgur.com/24PK1jW.gif.
Would like to see some WIP of course if I'm mistaken.