I know it says original in the tags, but I'm pretty sure this is from Strike Witches.
I'm going to tag it accordingly. If anyone has any reason to believe it's actually original, change it back, but it really looks like Strike Witches to me.
I disagree. Maruku has no history of making illustrations associated with franchises aside from 1 vocaloid picture. There is no mention of Strike Witches in the site update that accompanied this image. Instead Maruku writes out a dialog between the two sisters (pictured) concerning Halloween.
Eye color, hair color, clothes and other pieces of evidence don't mesh with Strike Witches; all there is that matches would be hair length, the cat ears, and 2girls.
The other one looks a teeny weeny bit like Sanya, but the eye color and the color of her ears is different + there's no character that looks like the long haired girl in this picture + the clothes are wrong
Man, they're dressed in witch costumes, and they resemble characters from Strike Witches. The cat ears aren't the only thing that's similar.
It's one thing to correct a mistake, which seabrook did. That's helpful. It's another thing to antagonize someone after the mistake has been corrected. That's decidedly unhelpful.