Sand the wall for the smoothest surface you desire. The smoother the wall the easier it will be to paint, draw and clean.
Wipe the wall to get rid of extra dust.
Prep surrounding areas. Measure and tape out the work area if need be.
Use a small or large roller to apply the chalkboard paint.
Let dry.
Roll another layer of chalkboard paint. You need to have at least 2 coats (possibly 3 for full coverage).
Plan out your design. You could measure everything, but I just found the middle of the wall and went from there.
Find objects that can be traced to create the frames. We used an oval paper plate, a piece of tagboard and a plastic circle that holds a paper plate.
Use a white piece of chalk to lightly sketch out the placement of your frames. You can trace items you found in the previous step.
Continue using chalk to design frames. You can be super precise or just kind of wing it. Repeating different simple lines will do the trick to create a frame-type feel.
Once you like your design, go over some of the lines with watered-down white acrylic paint (about 1/3 water to 2/3 paint). You really won't need much paint.
Let the chalkboard paint fully dry.
Prime inside the frames in the mural. Rub the side of the chalk in the area that will be chalked on. Use your fingers to rub the dust into the texture of the wall.
Let your little ones start creating.