The original entry for image has existed on Danbooru for a while at #492678. I was able to find a cleaner source on mandarake. However it still had a lot of halftones like the original and all sources I can find are scans. I ended up running it through a filter and this was the result after some additional cleanup.
You can see some comparisons here: https://imgur.com/gallery/mmEOkbd

The image itself comes from a scan of the box art for the Japanese release of the Arrancar vs Soul Reaper series Four Volume box set.