Vision: The "vision" here is basically just "Pinkie snaps over the idea of people not liking her parties, so she starts killing people.
Is that an original vision? Not by a long shot. But it's still an interesting one, and to this day I see grimdark Pinkie stuff that entertains or intrigues me. What's important about doing grimdark (particularly with Pinkie, since she's such a popular choice for it) is that you make yourself stand out somehow. And... You really didn't. The technical skill here is resting somewhere towards the top, but the originality of the piece doesn't really exist, and detracts from its potential.
It's still good. But you're not really telling us anything new or interesting here.
Originality: As I hinted at, this isn't very original at all. There's the traditional 2-ish stars I always dock for fanart, but past that, this isn't an original take on the show at all. It's an unoriginal enough take that I'm not sure what inspired you to do this: The show, another fanart image, or a fanfic. And if it's one of the latter two, I have no idea which one. There are too many. So this doesn't stand out in the crowd at all. In fact, I have another wallpaper from you that is very similar, just leaning towards "depressed Pinkie" rather than "psychotic Pinkie".
Technique: The technical skill here is a sight beyond most of what you see on DA. The layering of filters, altered transparency, method of fading Pinkie into the background... It all looks very clean and well done.
All of it, that is, except for the font you chose. Seriously, what the fuck is up with that font? I get it: It's supposed to be all "scratchy" like she's insane, but what it actually looks like is someone took an image of the text (with transparency) and blew it up to one hundred times the original resolution. It looks pixelly as fuck, and that's annoying.
Impact: I can't rightfully claim this left much of an "impact" on me. Most wallpapers don't, though, so I don't really see that as a point against you.
For what it counts, though, I was taken aback when I realized that someone I know made something this good. It took me a few seconds to comprehend that.All in all, the only point of criticism I can offer towards the piece itself (rather than the idea behind it) is that the text should either be in a different font... Or not there at all.
The idea behind this doesn't require text to tell. Hell, without the text, you open it up to a new plethora of interpretations, widening your audience without detracting from your impact. But if you feel the text is necessary, you need to change the font. And the wording of it. It's unnecessarily repetitive.Also, happy motherfucking birthday, bro.