Buy all the stencils to use in the beach scene. Stencils can be found at craft stores, online and even printed for free at some websites. (See Resource section below).
Clean and dry the wall surface in preparation for painting. Use a pencil to sketch guides for each stencil going on the wall. If you want a large area of sand, water or sky, be sure to paint these areas before beginning the stencil process.
Tape the beach stencils to the wall using painter's tape. Put up as many stencils as you can without overlapping. Leave the overlapping ones out until you're ready to remove the first set and start with them. Instead of tape, the stencils can be put on the wall using spray adhesive.
Tap the brush with just a little paint onto the wall over the stencil. The tapping motion is the best to use when stenciling to fill the area without causing paint to get under the stencil.
Start with the second stencils after the first has dried. Some stencils may have overlays to paint in a different color. Use the guide lines drawn earlier to place the stencils over the painted areas.
Remove any remaining stencils. Touch up any areas in the beach scene after all the stenciling has dried.
Clean the stencil brush, stencils and overlays with soapy water before any paint dries on them.