Everybody needs beauty as well as bread, places to play in and pray in, where nature may heal and give strength to body and soul.  ~John Muir
I know A LOT of people who struggle with dull looking skin; it happens for a number of reasons because of diet (eating junk foods & weight gain) stress or just because they haven't figured out a skin regiment that suits their skin type. I found this information online and It has been a great help to me and hopefully with you as well:
Essential Fatty Acids 
Essential Fatty Acids (EFAs) come in two classes, Omega-3 and Omega-6, and it is the former that have the most effect on skin and hair condition. The body cannot make EFAs, so they have to come from our food. Ideally, they should account for 15 per cent of our calorie intake.
Oily fish such as sardines, tuna and salmon are good sources of EFAs, as are nuts and seeds and their oils, organic eggs, prawns and soya beans. A quick way to increase your intake is to use sesame, rapeseed, walnut, soya bean or flax oils in the kitchen.
At the same time, you should reduce your intake of saturated and processed fats because these can cancel out the beneficial effects of EFAs.
  • Antioxidants
Not only can they protect us from minor infections, but antioxidant nutrients (which include vitamins A, C and E, some of the B complex vitamins, the minerals selenium, manganese and zinc, and certain enzymes) can also help prevent more serious, degenerative diseases such as cancer and heart disease.
Antioxidants play a major role in destroying free radicals - electrochemically unbalanced molecules that are continually generated within our bodies by chemicals, too much sun and stress.
The main victim of free radical damage in skin is collagen, which keeps skin looking plump and elastic. Uncooked, highly coloured fresh fruit and vegetables are the best places to find high levels of antioxidants.
Choose from: berries (strawberries, raspberries, blackcurrants); black grapes; Brazil nuts; broccoli; carrots; cherries; chestnuts; hazelnuts; kale; raisins; papaya; peas; peppers; prunes; spinach; sweet potatoes and tomatoes.
  • Vitamin A 
Involved in forming new skin cells, vitamin A helps keep skin supple and is vital for healthy eyes and hair. Dry, flaky skin can indicate a deficiency.
Best sources: Whole milk and butter, liver, oily fish and eggs. It can also be manufactured by the body from beta-carotene. 
  • Vitamin E 
An antioxidant, this works with selenium and has a powerful action against free radical damage. It also helps the skin retain moisture. Premature wrinkles, pale skin, acne, easy bruising and slow wound healing may indicate a deficiency.
Best sources: Vegetable oils, nuts and seeds, peanut butter, wheatgerm, wholegrains, avocados and sweet potatoes.
  • Beta-carotene 
    This is the plant form of vitamin A, which the body converts as required. It helps to protect us against the ageing effects of sunlight.
    Best sources: Dark green vegetables (spinach, broccoli, watercress) and orange fruit and vegetables (apricots, mangoes, sweet potatoes, pumpkin and tomatoes). 
  • Selenium 
    Protects cells from free radical damage and helps counter dry skin. Works with vitamin E to support the immune system, so can help fight infection.
    Best sources: Cereals, meat, offal, seafood, cheese, eggs, mushrooms, Brazil nuts, molasses, beans, wholegrains and wheatgerm.
  • Vitamin B Complex 
    B vitamins help to release energy from food for skin metabolism and have a role in keeping skin moist and smooth.
    Best sources: Milk, oily fish, poultry, red meat, offal, eggs, bananas, soya beans, wholegrains, wheatgerm, peanut butter, fortified breakfast cereals.
  • Zinc 
    Vital to the immune system and the manufacture of collagen, zinc also speeds up healing. Lack of zinc can lead to stretch marks and stubborn blemishes. A dull complexion, white spots on fingernails, and dandruff are signs of deficiency.
    Best sources: Seafood, red meat, offal, turkey, cheese, brewer's yeast, eggs, nuts, wholegrains and mushrooms. 
  • Vitamin C 
    A potent antioxidant, vitamin C is essential for the production of collagen, the elastic tissue in skin that declines with age. Smoking, stress and sun exposure can drain vitamin C from the skin, leaving it vulnerable to damage.
    Best sources: Peppers, potatoes, peas, kiwi fruit, strawberries and tomatoes. 
  • Iron 
    Important for the formation of haemoglobin, the red pigment in blood. A pale complexion and dark circles under the eyes may indicate a deficiency.
    Best sources: Red meat, liver, seafood, eggs. Less absorbable iron is found in green leafy vegetables, dried apricots and fortified cereals.