Eva's essential oil serum is comprised of concentrated plant extracts that are commonly used in skincare products, including serums, due to their potential benefits for the skin. Here are some potential benefits of using an essential oil serum on the face:

1. Hydration: Essential oils can help to hydrate the skin and improve its moisture content. Some essential oils, such as rosehip seed oil and jojoba oil, are particularly effective at hydrating the skin.
2. Anti-aging: Many essential oils have antioxidant properties, which can help to neutralize free radicals and prevent oxidative damage to the skin. This can help to reduce the appearance of fine lines, wrinkles, and other signs of aging.
3. Improved texture: Essential oils can help to improve the texture of the skin, making it look smoother and more even. Some essential oils, such as lavender oil and tea tree oil, can also help to reduce the appearance of pores.
4. Reduced inflammation: Some essential oils have anti-inflammatory properties, which can help to reduce redness and inflammation in the skin. Essential oils such as chamomile oil and frankincense oil can be particularly effective for this purpose.
5. Acne-fighting: Some essential oils, such as tea tree oil and lavender oil, have antimicrobial properties that can help to kill bacteria on the skin that can cause acne. They can also help to reduce inflammation and redness associated with acne.

Overall, using an essential oil serum on the face can provide a range of potential benefits, from hydration and anti-aging effects to improved texture, reduced inflammation, and acne-fighting properties. However, it's important to note that not all essential oils are suitable for all skin types, and some people may be allergic or sensitive to certain essential oils. It's always a good idea to patch test new skincare products before using them on your face, and to consult with a dermatologist if you have any concerns.