What a lovely game!
I agree with some other comments regarding difficulty, I did get all the pictures but the sun and the watermelon took me sooooo long (haha the seeds were a real challenge). But hey, on the other hand, it was exactly the difficult that kept me hooked because I was always on the verge of getting it (85%, 87%, etc).
Other thing that would be nice is a quick way to restart the painting (because sometimes you realize you screwed up and you won't win the game but you have to go through the whole drawing).
The crab model is absolutely adorable and the game is super polished. The concept of the game is pretty unique and fun, and the idea to allow mixing colors by using both buttons was the cherry on the top. Overall really solid entry, great job!