I am willing to give away a trick to painting wall murals for those who want to try it at home. You can start off with your own drawing or a picture that you want to reproduce. (My kids chose Disney themes since we had seasonal passes the year we moved into our home).
Start by drawing a grid of horizontal and vertical lines, evenly spaced, on your original. The number of lines you
use will depend on the amount of details in the picture. The more details the image has, the smaller the sections you want to divide the image into. Repeat the same number of sections, equal distance apart on the wall that you want the image reproduced on to. Then section by section, copy the picture from the original onto the wall with pencil. Take breaks often, and stand back to see where you need to make corrections.
When completely drawn, you are ready to paint. I used latex wall paint for the background since these were done in my children's rooms. Leave the area for the design white until ready to paint the design itself. I used acrylic paints for these projects, bought at a local craft store. I added planets at the top of the wall, (not shown), and glow in the dark constellations to the ceiling for extra effect.