I will bite...from the left - miku, yotsuba, ichika, nino, itsuki
from the right two of them don't have an earring on their exposed ear (yotsuba had two peirced into each one of her ear), miku's giveaway is her smile (bit flat than the other) her hand posture, nino's giveaway is her hand under boobs posture, same with yotsuba's clenched fist because she's embarrassed.
I expect to be proven wrong as the quint are good at impersonating each othee. The one with clenched fist could be itsuki, so yotsuba is either the middle or second from the left