I don't really see this is Sepia with the red clothing and pink barrets. Aside from that, alot of hte phtoos very dark and you can hardly tell whats going on. the barrett in the hair is distracting.
Sepia tone refers to the coloring of a black and white photographic print that has been toned with a sepia toner to simulate the faded brownish color of some early photographs. Your image contains other colors too, thus not really following the challenge theme. Aside from that, the faces are too shadowed, not allowing much detail or emotion to come out.