So a few days ago I found this page that is pretty much a Tegaki, but way cooler, I believe it's made by the same corp. that Pixiv is, so maybe that's why.
The page is called "drawr", the only flaw I find it is that you cannot name the pictures, or tag them, so you cannot search for a certain picture either ( or at least that's all I know ).
If any of you has, let me know, and, if you're going to create one, add me there so we can keep in touch through Drawr too !
My drawr:
drawr.net/darkmorriganryoko