The colours, which are made by grinding dry-powder pigments in pure water, dry and set with the plaster to become a permanent part of the wall. Fresco painting is ideal for making murals because it lends itself to a monumental style, is durable, and has a matte surface.
Answer: Just show something similar to concepts of power, you could show a woman holding an upright hand, representing power with the word women or something, etc.