Top to bottom, left to right, I believe the references are:

1. ?
2. World is Mine
3. ?
4. ?
5. (It's just Miku!)
6. Romeo to Cinderella
7. Matryoshka
8. ?
9. Koi wa Sensou

edit: I didn't think to use notes for this, thank you!

I'm probably wrong, but I feel like #3 is Bacterial Contamination (or some other Deino song).

I feel #4 looks closer to Bad End Night Miku than Suna no Wakusei. Especially with the background, hair length, and color :)