Here is it!
Tell me what Should I Improve, Change, or Remove from this wallpaper..
What do you think about it?

"Out of ideas, hunh? Well, there is one thing I recommend: this wall only needs a lettering on its right side and you're golden."

"I'm not a wallpaper guy but I have some sense of art, so this is all I can say. But try it, it will look nice."

"What you should write there...well, you don't have much limits: if the wall is related to a game/anime, the lettering should be its title and a common quote from it. If it's your fic', then...anything except 'Love and Peace', unless the wall is dedicated to me ^^."

Interesting idea, the juxtaposition of Shana in her two forms. But the composition very strongly divides the entire wallpaper into strips, which lacks a flow to connect them physically (not conceptually, which is already nicely covered.)

Quality wise, the two scans at the sides have a few little bits of artifacting, if you zoom in and look hard for them. No big deal, but nice if you could clean them up. There's a little triangle of white between her sword and her hair in the center-right scan that looks like leftover from extraction.

Good luck!

Great idea. Change the 'Naked Shana' scan. It doesn't fit. and everything else hamstersanonymous said.

What's the idea behind the mirrored image in the middle?
I would suggest adjusting the colours of each block to make them look somewhat consistent. Not meaning the same colours, but at least the same brightness or vivid-ness e.g. the image on the right is very dull coloured compared to the rest. I also wouldn't put red against another red in this type of layout, would personally prefer different colours for each block.

What do you think about the Background color?
I think I need to change it. But, I'm out of Idea.. So, tell me please! What should I do for the background..
By the way, thank's for your comment!

Bcoz of the overusage of scans onto a wallpaper, there is hardly any space left for your adjustment, ideas like what you are thinking off, cluttering the wallpaper with scans are not pratical, for one thing, the scan at the left or right tends to block icons and that is rather inconvenient because no matter the beauty, the incapability for it to be presented is poor.

Now, as you can see, due to the idea presented, there is littel space to play around with, first thing I see is that the whole wallpaper is filled with eyes and faces. It is rather low effort if not blurry.
Wallpaper ideas like this one will need a hell good of a vector to work with, you will at least need to look for that.
Then, if you do not want that, I highly suggest you choose 2 of the scans that you are using now and do the other two away for another wallpaper.

This would give more space and more generally a design to add to the wallpaper itself.
So far I can see now is that the wall is telling me you did this with little effort by sticking frames of scans onto the wallpaper which made up the wallpaper itself.
I suggest you change that in general. The rest will come later.
Think of a plan for your layout, the place the characters, that is fundamentals of walling.

Also, try not to play with shadows if you do not know how to play with them, the two shana middle scans, the mirror image shows the shadow on the feet to be little blobs tipped away, no sign of the body shadow, indicating the fire at the background is only a layer, indicating low effort, either with or without it, with it, you have to work more with it to make it work.

I hope this helps.

Hmmm.. Well then!
What should I do with the Background?
What should I use, is I remove 1 of the scan?

Probably extract, and make them smaller, then put them on the bottom of the wall and just continue the atmostphere
so that they have all the bg up the wall
vectoring them is an excellent option to show you've actuallly thought about it and done something
to improve
C:

IMHO, you should try to focus on one of the character instead of trying to display all 4 parts

i dunno, but might be tried to enlarge 1char over the other, and kinda blur the rest into the background.

again, the colour balance must be right, try not to cause the viewer to loose focus

highlight one part and blend the rest into the background...

geez, i'm having tought times conveying my mind... but i really do hope you got what i mean

thanks & good luck

kris

Tools for photoshop are best obtained at www.deviantart.com
just search for "photoshop resources" when you browse, there should be plenty.

brushes, etc, are all over there, the real question is, are you able to use them?
if you don't I highly suggest going throigh easy learning tutorials from www.tutorialman.com / www.imanimetions.net

then, to make things glowing have two ways, using of light textures (ver damn hard and waste of time IMO), or using blending.

On every layer, there should be a drop down menu that says "blending options" on top.
(within the layers tool box), then just play around with the blending layers.

You must duplicate the part you want it to glow, say a fire layer, and play around with it.
you play with the blending effects on the duplicated layer. This makes sure you do not spoil the original in case you do not like what you made.

If someone said this sorry, but I think that you should have some open part. Its too much, and if you were the person putting it on your desktop, then you wouldn't want to cover shana with your icons.

Can you make the lines unclear...hmm dunno how to explain, kinda make it transparent i think? suggesting only..>.< don't take it seriously

Are you sure? I think if I make it Transparent, it will looks weird!
Hmm.. But I will give a try on it!