On the very first look they seems to be similar...i notice a different expression in their faces though! Twins are always facinating and I asked me how to feel as a twin? Strong impact with your treatment and framing, fully agree with the comment of Phil!
****A stunning portrait, Jen -- not only do they LOOK alike, but they FEEL alike as well. Your black and white image seems to flow because of the diagonal composition and the children seem to glow because of the interplay of light and shadow on their faces. Even their t-shirts are alike!