If you feel your skin is dull, I suggest you spend some time outside every day, at least 15 minutes, to get some sun, which is effective even on a cloudy winter day. Also make sure that you get enough essential fatty acids. They can be found in evening primrose oil, hemp seed oil and flax seed oil, for example. These are long-term solutions that will definitely pay off over time, by giving your skin a wonderful appearance.
 
For an instant fix, you could also do a simple facial at home - just boil some water in a pot, add a spoonful of herbs (chamomile, peppermint or rose, for example) or 2-3 drops essential oil, put your head over the pot and cover with a towel for 5-10 minutes. This will clean you face, open up the pores and clean the impurities from your skin.

Afterwards, scrub your face with ground oat flakes and wash with soap.

Apply a moisturiser .

All my natural, organic moisturizers are packed with pure shea butter and golden jojoba oil. They are concentrated, great for dry & sensitive skin and ideal for daily all-over body use - including face, hands and feet. Give yourself a 5-minute facial massage using one of them.

If you do not have access to a moisturizer, you can use pure virgin olive oil or jojoba oil. There you go - simple facial for next to nothing, and you do not even have to leave the home.