Limit the number of colors you use to paint for a more professional look.
Plus, you'll learn faster how to mix colors effectively.
My newest video shows how to set up a complete palette, using red, yellow and blue (primary colors) to mix secondary colors (orange, purple and green) and neutral tints - browns and dark grays.
Here is the first painting done with that palette. See how the colors glow? Here are two more from the same palette.