9.5/10
There are a lot of good things happening in your sig.
First off, it's simple. But simple as in CSS and text. I'm not counting the image itself.
Next, the image. I dunno if this was a render + scenery from the series or if it was a screencap that you managed to cut well (assuming the former; if it's the latter, then bravo), but regardless, you did a good job. Sasaki really stands out, and you're much better at text in images than I am (I probably couldn't even pull off decent text on a white/transparent background).
The only thing I don't really like (this could be totally Safari, by the way) is that the shadow dropped on the text in the bottom left seems a bit blurry. If you could change the shadow background/the text color itself. It's sort of the same with the binary number, but because that's on a white background it's a lot nicer.
Overall, you need to keep it up with sigs. like these (b' ')b