Koi Boy - Correct
Hamantha - Correct
(Cheese)Burger Family - Correct
Two Time - 50/50 (answer depends on what song you're thinking of when looking at it, I guess, though this is actually a reference to a character, not a song (assuming you called the thing hung on from Two Time).
SHOP; A Pop Opera - Correct
Finite Form - Correct
Opal - Correct (Great job on this one, I thought the biggest Easter Egg would be one of the hardest to catch).
Christ Potion - Incorrect
Total Missing: Five (Six if you count the Two Time answer as wrong).
Four things are very small Easter Eggs drawn to blend in and be hard to figure out. One other Easter Egg is right out in the open, but you may not have seen it as an Easter Egg.
If you want any hints, just let me know, though I'm unsure as to how to give you hints without directly revealing the Easter Eggs, but here's one hint I can think of telling you that doesn't reveal anything that easily:
Think of one of Jack Stauber's most popular songs while looking at the photo, then seeing what lyric can match a certain something that references the Easter Egged song.