The girl next to Lielle is Maid Linda, just go to Headmaid Ryia in the secret room to get the CG Scene.
The girl next to Zady is Maid Mary, to get her scene you need to have Elly in your team, Then talk with her in the throne hall. After that, go to Headmaid Ryia to get the CG Scene.
The girl between Irinlia and Sara is Lace, for now the CG Scene for the good path not completed yet.
Sorry for bad english XD