To remove the crayon, pour a small pile of baking soda on a small plate. Grab a washcloth, get it wet and squeeze as much water out of it as you can. Drape the washcloth over your index finger, dip the tip of that finger in the baking soda and rub it on the crayon marks. It will all come off and it shouldn't take too long, depending on the amount of crayon the little artist used creating this work for you. Rinse the wall before painting.
For the permanent marker, rubbing alcohol takes this ink off of most surfaces, but I haven't tried using it on walls.
After I cleaned all the crayon off my wall, a funny thing happened. The crayons mysteriously disappeared....:whistling2: