They're sisters, hence the title. And I sure hope I drew these sisters correctly.
And I want Erin Anna's dress and shoes.
This picture is sorta big, so if you want to see all my mistakes, you can download the high resolution. YOU DON'T WANT TO SEE MY MISTAKES.
Hope it's okay ponyochan! I really hope I got their hair right. I kept mixing them up and confusing myself, so if I got it wrong, I'll fix it.