It will be interesting to see what items end up being offered, but things are off to a great start given how useful Moonstones can be in the game.

Source: https://comicbook.com/gaming/news/disney-dreamlight-valley-holiday-ddv-giveaway-free-moonstones/

Once they've submitted their image, fans will gain Pixel Dust, which will help them level up on the new DreamSnaps track, unlocking a variety of rewards, including exclusive clothing, furniture, and Moonstones.

Source: https://bleedingcool.com/games/disney-dreamlight-valley-adds-dreamsnaps-update/

The game's currency is called Moonstones, and unfortunately, they are quite hard to obtain.

Source: https://gamerant.com/disney-dreamlight-valley-earn-free-moonstones-dreamsnaps/