That’s a great explanation BigCatt.
The base color is the color of the flower without the (any) markings. It can be white, yellow, green or even red. As pointed, it’s usually discernible by the back of the flowers. Imagine a painting whose base color is the white canvas.
Overlay means the second layer of color over the base color. This is usually a SOLID coverage of a certain area of the flower. For example flamea pink overlay the half of the petals. In the painting analogy it would be the blue sky over the white canvas.
Suffuse (or flushed) means LIGHTER color over the base color in a certain areas of the flower. For example, a pink diffusion of color at the white petal tips, around the dark flamea overlay. In the painting, this could be the white clouds.
A picotee is the margin border of the flower part, usually described on the petal rims. It is usually a thin white border around the petal margin that demarcates from the base color (such as from pink petal base with a white margin). In the painting, this would be the frame.
The lip description is usually divided into 3 sections:
The inner throat, side lobes and midlobe (the large flat face in front).
The throat is usually described with a color (eg golden yellow in Cattleyas) with/out striations.
Side lobes are only described if different color that the midlobe (eg striated or solid dark lavender).
The midlobe is described with the overlay color by parts (sometimes up to 3 or more sectional colors) along with the color of the spots (or ‘eyes’). For example, midlobe white, striated magenta distally, with pink picotee, and two yellow eyes. In the painting analogy, it is like coloring a bird with the head as the throat, the body as the side lobes and the wings as the midlobe.
Hope this explanation helps.