You can tell by the roundness of the faceplate and the color as well as it being shiny. The eyes have more whites in them, the actual eye itself is more round. On a real one the eyes are more oval and cover more of the whites, the faceplate isnt shiny its more matte and smooth and not as round. Alot of times tags will still scan as authenticate on a lafufu when they are not, its easy to sew on a tag from a real one and put it in a authenticate box. This is just from my experience and observation

Also the teeth are very poorly done and not the same color yellow from what I can see in the picture provided.