This coloring page is an inviting challenge for any artist. The bright red of the triangle will make an effective focal point, and the black letter "P" on the white sign can be rendered with intricate detail. To really make the image stand out, add a light blue background as a backdrop. Then, fill the triangle with a bold dark red, adding a white outline to make the exclamation point stand out. Use different shades of red for the inner triangle and make sure it does not have too much of a gradient if you wish the exclamation point to stand out. Finally, accent the whole thing with black for the "STOP" and the letters on the parking sign. This will create a bright and eye-catching piece of art!