Here's the link http://i135.photobucket.com/albums/q139/kamoai/rukialightningcopy.jpg
This is my first attempt at making a wallpaper, and I need a little help. How can I make this better, and are there any obvious things I may have done wrong? :) Thanks for any help you can give me!

Kamoai~

First off the scan needs cleaning,it's too small and it's floating.Then your background is way too simple,try harder.
Ow..and you should remove that glow from the character and find some other way to blend her into the background.good luck.

I changed a lot of things and now I think it's too.. busy, I don't know, more feedback please :)
http://i135.photobucket.com/albums/q139/kamoai/rukialightningcopy.jpg

Hmm I like it though I think the test could do with some fixing, Maybe add some texture to it or try and give it some depth. I think this could have great potential for a wonderful scan it just needs some cleaning and tweaking here and there.

I added some texture to the text and tried to make it blend a bit more smoothly.
http://i135.photobucket.com/albums/q139/kamoai/rukialightning-1.jpg?t=1165773003
^^

First of all, I think you should remove the "bleach" or change it, because right now it doesn't look good.
as it was said before, rukia needs some cleaning, she is too blurry.
about the butterflies, I suggest you to look for numbers of different pictures, because it doesn't look well (by my opinion, you don't have to change it) when they are all the same.
I think you should change the lightnings, but that's only my opinion.

Uh... The minimum size requirement for a wallpaper here is 1024x768. Your's is way too small, and it's not even the right dimensions for a wallpaper. That being said, the "film negative" effect is really odd looking, and the background has no coherency or reason to it.

My advice? Scrap it and start again. And read the FAQ.

The actual image size is 1280 x 800, it just shows it smaller in the link. I did read the FAQ, but thanks for trying to be helpful. ;o I am still working on it / changing it right now, don't know when I'll be done, just wanted some feedback on it. ^^

Wel,it's not bed,but you can do it better!! So do it!! I belive in U.:)

Okay please at first let us see the ENTIRE version of your wall. It's always better to comment on the full version.
Also try to imagine the entire scene and make it the way you feel...

What I can say about your wall is that flames on the right have no meaning.
The trees behind are way too small it makes your scan look huge... If she's on a field you're supposed to see the trees higher than her knees... Perspective is really wrong in this wall. And you also need to get them more dark.. Don't lower the opacity of this layer!

About the lightning... It's not looking great cause it's way too big and highlighted wrong... Now it looks like a strange branch... You need to remove the glow behind it and make it smaller...
And also I don't see the connection between the pose of Rukia and this lightning...

About the scan : Even on this small version we all can tell you the scan is poor quality. I know you probably put it in negative style to get it darker but you have all sort of way to do it without using this option... Also you need to get the clearer parts darker Cause here you have some very light parts on your character which is looking pretty bad...

I guess you should think a bit more about the composition of this wall at first... For me you should get a better scan with a pose that fit the lightning...