The artist is Aoki Shin if you want to search more from this mangaka.

Everything started from this picture.
The hardest part to vector was the flower bed. It took a lot to make the outlines of the flowers and they're still quite messy (as in the original).

I used a few drops of blood, more would've ruined part of her grace; loads of blood and frail girls kinda look barbaric.

The background is weird. A cathedral surrounded by dark houses makes the perfect set-up for a vampire attack.
At first I made to flowers' outlines white and the flowers black. It was a bit too sharp to look at, so I switched the initial white with dark red.

Overall, the wallpaper was difficult to make, but I'm pleased with the outcome.