I really like the tone of the story and characters you are going for here. A brother morning his twin whilst remembering their relationship is a tricky thing to do right with any word count but you certainly succeeded in bringing over that tone here.
If I was just to give any advice it would be that it could have done with batch of proof reading or even simply reading it aloud to yourself to see how it sounds. The actual events were a tad difficult to follow and I had to reread a couple of bits to click what you meant. The flow and clarity would benefit greatly from that.
Despite that, I loved the tone you aimed for and the imagery of a reflected twin's face is always a powerful one. Well done!