I found this image a little while ago.
It appears to be fan depictions of the magical girls who end up becoming witches who are fought in the series. I know that:
The 2nd one is Elly due to the the apperance of the screens on her left and the doll thing which is like Elly's Minions
The 5th one is Elsa Maria due to the appearance of the Sun above her head
However I don't know which witches the first and fourth girls are supposed to be.