Yes Vaseline can be used on your face as a moisturizer.
Vaseline is a good natural skin moisturizer as well as being able to help keep moisture inside your skin so that your skin does not dry out.
You can apply Vaseline to your face and skin and massage it in and it will help keep your face and other parts of your bodies skin moisturized.
You can also apply some diluted essential oils, or even olive oil or coconut oil to moisturize your face and other skin.
Coconut oil is one of the best natural skin moisturizers that you can use on your face and other parts of your skin.
Then also apply some Vaseline to seal in the moisture.
You should also use a face cleanser and facial moisturizer lotion or just plain facial moisturizer to clean your skin and help keep your skin moist.
Also using a humidifier or vaporizer helps to add moisture to the air and to your skin and it's good for your other health as well.