Create a 3D-style digital image of the alphabet 'O' with a fluffy, short fur texture in a bright yellow hue, resembling a soft pom-pom or a cuddly toy. The letter should have a cute, exaggerated, and rounded form to accentuate its plush texture, set against a stark white backdrop to highlight the fur's light and shadow interplay. Ensure the image maintains a square aspect ratio of 1:1.