In Season 7 Episode 4 titled *The Spoils of War*,

> 
>  Jon Snow shows Daenerys cave drawings made inside the mine at [Dragonstone](https://en.wikipedia.org/wiki/The_Spoils_of_War_(Game_of_Thrones)):
> 
>  Jon shows Daenerys the mine of Dragonglass. Venturing further into the
>  caves, he shows her carvings made on the cave wall by the Children of
>  the Forest, depicting the Children and the First Men fighting together
>  against the White Walkers. Seemingly convinced that Jon is telling the
>  truth, Daenerys vows to fight for the North, but only if Jon bends the
>  knee.
> 
> 
> 

The cave drawings appear to be vivid and bright without much fading.

[![enter image description here](https://i.stack.imgur.com/TGtBE.jpg)](https://i.stack.imgur.com/TGtBE.jpg)

[![enter image description here](https://i.stack.imgur.com/1ItUk.jpg)](https://i.stack.imgur.com/1ItUk.jpg)

**Were the cave drawings actually drawn by the Children of the Forest? Is there any evidence that Jon Snow drew them himself to convince Daenerys to fight the White Walkers with him?**