When the first wallpaper is accepted is quite a nice feeling, right? And even more if is from your favorite series and contains your favorite character as well. Was by me the same a year and half ago. Nice memories, yeaz...ok, but now to your work.
Your wall is fair for the first time. But will probably not clash out from the average, and when I may be a bit strict and consider the walling level of AP guys, a very bit under average.
Character quality is okay, also with the blending. (of course is not on the level of a vectored one, but thats nothing what I await from a new waller). Brushes can be too, but definitely I won't go for scanlines on a scenic wallpaper. And your main problem is the too much Sesshoumarus. You used the same scan in different versions, but I don't recommend even a different stance from him. In short, on a good wallpaper the same character is just once.
The small ones are not that bad, but definitely not the big in the downer part. Even his style is different and don't gets with the rest.
If you feel being a bit plain cause them, try some objects rather. What I like, how is the text made. Definitely a big plus.
Resolution. You are 40 pixels short. It should be 1440x900. And I recommend next time 1680x1050 or 1920x1200.
Hope my comment helps a bit to improve.

Wows at aki's comment
anyway i think this is really different from wat you usually see which is kindda cool
it brings me back to kid days
this has a nice feeling overall
even though i lost interest in inuyasha
good job for first wall!
andway i think this deserves a fav from me