During this week I worked on a second rotoscoping project using another part of the same footage I used for my first roto project. After the roto was done, I applied the girl in two different still images and matched the colors.
For my second rotoscoping project I had the goal of using many shapes to achieve a better result in the alpha. When using large shapes your alpha becomes shaky, with a lot of bobbles. To achieve a smooth result, one should use small shapes and move them as little as possible.
Below I posted screenshots to show the shapes I used.