There are two methods here. Both require that you EXPORT the painting in the settings menu, not just save it. The first is by physically connecting your headset using a compatible cable and then locating the game's folder in the headset's root directory. This will be located in 'Quest\\Internal shared storage\\Android\\data\\com.Oisoi.PaintingVr' will also be where you can find the folder to put in your reference images.  Just as with the PC version, you want to grab the version of your painting in the SCREENSHOTS folder. savedPaintings is more of a saved-games folder. This folder's versions of your artwork will not be the same as the in-game perceived product until you export it. The second is to go to the Quest 2 menu and select it using the screenshot menu. You will then be able to share it with yourself or your preferred social media.