I like it. A few questions immediately come to mind: how did Lara Rose cause her identical twin sister to disappear? Did she kill her? Where did she go? And secondly: why?! She certainly isn't feeling too good about it... I would read on to find out.Lara Rose hadn’t felt complete since the day she caused her identical twin sister to disappear.
She was starkly reminded of that fact yet again as she watched the twins across the classroom. It was her first English lesson of the week, and a sharp pang had gone through her when she saw the two students she’d be spending the year with.
I agree with this. If you'd replace "identical twin sister" with her name, it would be even more intriguing. More so because you talk about the twins in the classroom in the next sentence, which will get your readers to probably understand that [name] is her twin sister after all (why else would Lara Rose feel a sharp pang watching the twins otherwise?)I was also thinking, what if you replaced "identical twin sister" with the sister's name instead. And let the reader figure out, from her twins in the classroom angst, that Lara Rose's sister was her twin.
-Derek