I've loved this scan of Saber since I laid eyes on it some time ago. Probably one of the better scans out there of Saber, it certainly can be worked with and has a lot of impact to it as well. While I love the creativity behind this wall, I'm a bit torn with several things.
One of my favorite things is what you've done with Saber. She's got this painted look to her and I really like it, however the problem is that you've got this painted character on this background that doesn't necessarily fit as nicely. I, personally speaking, feel she'd be better suited on a similar style of painted background to go with the work you've done. Also, another thing is that her ear stands out, and not necessarily in a good way. It seems to strike me more as a vector style, which differs from the painted style that she has throughout the rest of the piece.
Another issue that I have is while I enjoy what you did with the background, it tends to become far too much of the same color as Saber's outfit. While you've got some gradient in there and some lighter colors on the right side, It just feels like a ton of reddish orange on the screen and while I do think it's rather nice, with the color choices it's a bit overpowering.
I'm also a bit confused by the text. While I'm a fan of the the phrase, I don't exactly see how it fits into the wallpaper itself. Especially since the only aspect of it fits with the glitter-style effect you used near the text itself.
I don't mean to come across as so harsh. In fact I really love the creative aspects you explored and the choices you made, there's just a few things that I think need to be altered overall. Good work!