Salve carissime! =)
Original Art :
I really like it! I love how you used the solitary figure and then expanded the nothing-ness to increase his level of loneliness. The change in colour is a good choice, because the orange brings out more of a sunlight effect, whilst your white seems to show a harsher white light. And in using that white, it really brings the focus onto the character, because of the contrast with the dark murkiness of the rest of the wallpaper.
The "glow" though, does look a bit odd though, because of the way it's positioned. If it's a "light hitting him" glow, then it should only be coming from the left hand side... But there's a bit of a glow on the right hand side, where the light wouldn't hit... I'm assuming that it's a matter of extraction, because the original picture had that glow too, and it would have made it rather hard to extract the image... I can see that you might have used it to give extra emphasis to the character, but I think that just using that bright white is really enough.
Choice of Colour :
Well, like I said, I like the white ^^; Usually, I find that people overdo the bright colours in a dark wall, but I'm glad you used what I would consider, the "right amount" of brightness. It's not too painful to look at, and it's a point of interest, so congrats on a good job =)
I think that brown is a great colour [unless we're talking about our school uniform... XD] It's a good way of not using a bright colour, but avoiding the greyscale spectrum. And brown usually looks very good with red, because of the blood connotations, which really brings out the dark feel to this ^^
On the other hand, I have no idea what the round ring-like objects are... And the colours seem a bit odd compared to the dark murk that you've created... You'll have to explain them to me =P
Background :
The scrawl and stained effects aren't overdone, and create a great kind of filling for what would otherwise be a too empty area. Again, I really like how it adds to the murky, unclean kind of feel to this wallpaper.
I like how you tried to recreate the shadow of the wings [?] in the original image, but I liked the smoothness of the original shadow... The bumps in your version seem a bit like you had trouble with control. You probably did it deliberately, but when someone's looking at it, they can't exactly be thinking exactly what you were thinking, right? =)
The text is an interesting way of approaching the background, but I like how you borrowed that from the original, and then applied your own style to it. The font is less "fun" than the font in the original fun, and has that old typewriter kind of feel to it. I think that's a great way to reinforce the murkiness, because "old" seems to bring connotations of "wrong" [especially in our age of progress and all that].
Text :
Actually, I didn't realise there was text until I looked closer, because it's very hard to see. Also, positioning it more towards the top means that you leave this blank-ish area underneath... Which does feel a bit odd. It's not as noticeable for me, because I happen to have icons there, but for other people, it might be a bit more noticeable.
However, I like the way you put the text together, there's a sense of connection between the two parts of the text, because of the circle shape you used in that area. The "reunion" font reflects the font used in the background, giving it a bit of connection with the rest of the wall.
But I really find it hard to read the "mind/unsoul" bit... The black really blends in with the background, and especially with the splotches in the vicinity. [Sorry, my screen doesn't get any brighter... =( Maybe this would look better on a brighter screen...]
Useability :
Well, it's definitely useable for me, even though the character happens to be overlapped by a few of my icons... I can move them so it's not a big deal.. [I also assume that you designed it for your desktop and not mine XD] But generally, it doesn't look too bad on the desktop ^^
Overall :
Overall, I like this wall, but it's mostly those ring-shapes that are irking me because I don't know what they're doing there, and they generally don't fit in with the theme [well, what I think is the theme] of this wallpaper.
Good work, dearie ^^
- Lots of lub, Tevi