As an animation, Bakemonogatari has a simple, clean art style. But the guest illustrations for the series are anything but simple! So, it's great to see that °Tens took on a more complex illustration and made it his own with vector gradients so fine at points it more resembles painting that vectoring. Do have a look at this beautiful wallpaper!
I love the concept of it
But it kinda looks over crowded...I think you should focus on your main picture more...oh yea ghosting effects should be minimal I think.
The scan is extracted very nicely. I recommend taking off the bigger scan versions of Ciel and Sebastian. They are poor quality and you'd be better off without them. The black brushes that repeat all over the corners I also suggest to remove them. Other than that it's lookin good, keep at it. ^-^
Good job on your first wall.
Although it looks a bit too busy in there, but all parts of the wall seem to go together.
The bottom of the wall where you used a brush seems kind of out of place because the rest of the wall is textured and the brush is pretty clean.
Nicely done on extracting Cecil and Sebastian from the scan.