Skin's dullness can appear due to a number of reasons, such as sun exposure, lack of certain vitamins and minerals intake, aging, lack of sleep, or dryness. The face starts to look tired as it dulls down. Dullness can be reduced by adding a potent serum containing ingredients like honey matte or melon extract, etc., to your skincare routine. Using appropriate moisturizers, creams and essential oils can also help. Taking a proper diet with a full palate of nutrients is the root of having bright skin.