Is there a full/original version, or did someone create the Safebooru logo themselves? I really like that girl and was hoping to find a larger version of it (perhaps without "Safebooru" in her hand).

The image is made by signomi, you can find them here:
signomi.deviantart.com/

Is this is hand-painted？？

Where did the 'booru' mascots come from(the girls that hold the numbers)?
I know I've seen fanart of them before, but I've done searches and came up empty. They need more fanart, but I have no idea who to credit.
Anyone know where they started from? Thanks!