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Pictures of Hentai Puzzle 11

Level 1:

Listed here or here (and on some other places) as an animated gif of Seikon no Qwaser (II) (the symetric picture is used in the game)

Level 2:

Seems to be the picture of Shizuka Marikawa from School of the Dead (check in google image)

Level 3:

Seems to be from Isshoni Ecchi Shiyo - Miyazawa Akina Hen - 01 (source)

Level 4:

Seems to be Yagyuu Juubei (from Hyakka Ryouran Samurai Girls) (source)

Level 5:

Unknown source, but you can find this picture on the web (example)

Level 6:

Seems to come from Asa Made Jugyou Chu OVA (source)

Level 7:

Seems to come from Rumi (Haha Musume Donburi Oppai) (source)