Wow, nice. This is excellent to hear, though a carrier oil is really recommended. Tamanu or coconut (Tamanu is likely the best choice, as it has a great many therapeutic properties which apply to your use which you can read about here
....and more on using essential oils for sun damaged skin here
The thing to watch out for is that the oils CAN cause irritation if continually used neat -- I find Frankincense will do that fairly quickly -- and Lemon is considered highly phototoxic, meaning it will make the skin far more sensitive to UV light rays. So if you apply it, that area of skin should be covered from sunlight for at least the next day, some therapists say up to 72 hours.
A great blend to improve skin texture using a carrier oil could certainly include the oils you're using...and there are a couple of essential oils that are highly regarded for this use:
In one ounce of Tamanu oil (which does have a little funky aroma, because of the way it's aged to improve its therapeutic value -- I don't mind it on my face at all, one customer had expressed they didn't care for it so much -- but not SO much that they stopped using it!
... you could use
1ml (35 drops) Sea Buckthorn Berry CO2 (this is the oil that's so highly regarded for helping all sorts of skin conditions, including improving texture and smoothness)
That's a pretty strong formula for the face, though of course you've been using yours 'neat'...and I would be careful with the Lemon, as noted -- you can include it in the blend, just notice if sun makes your skin uncomfortable (I have noticed this as a feeling of a sunburn from being in the sun for only a short time).
Keep it up! So glad to hear the oils are working for you!