Opening Animation
This animation is just like the up & down animation, except the line comes from the middle instead of the top and bottom. First, just start with a black horizontal line in the middle.
In the next frame draw two lines on either side of the pixel where first black line was, and so on, just like the image on the right.
To shade, use your second-darkest color where the red is on the animation on the left. Repeat this step until you have all of your colors on the animation. I hope this helped you! Practice this a little bit, then go on to the next animation.