Why Identical Twins Look Different?

If by chance one identical twin 'silences' the X chromosome that came from Dad's sperm and the other twin silences the X chromosome that came from Mum's egg, then they have different genes working in their systems, which can result in noticeable differences.

Why do identical twins look very similar but not exactly the same?

Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. But there are environmental differences that can affect the way they look and behave. ... As identical twins get older they may look more and more different, because they are exposed to more diverse environments.

Are identical twins 100% the same?

Identical twins form from the same egg and get the same genetic material from their parents — but that doesn't mean they're genetically identical by the time they're born.