Meh, i don't see a reason for flagging. Sketches are allowed on danbooru, and blurry lines and coloring is because of style, not bad quality. But our greatest and always right flaggers will not stop doing unnecesary stuff.
This hasn't even gone through the queue once. If it's deemed good enough, surely it will be approved. What's the point of raising a stink about every single flag you don't agree with?
I'm not the flagger, but I don't think this'll make it out of the queue regardless - based on that some moderators have already passed it over, and a couple for the reason of "poor quality"... and that I also won't be approving it, and I seem to be the last hope for most images.
My reasoning is that, while I disagree with the flagger's reasons, I do think the picture is not up to snuff. I don't think it has bad lines - they look fine; your standard sketchy lines to me - or poor coloring, as the coloring looks alright to me. For me, it's a combination of subpar perspective and anatomy. The right and left hands match up awkwardly, the torso and chest seem odd, and the lower part of the face isn't well done.