Sienna has curly brown hair, pale skin, and freckles. She wears a white turtleneck sweater with orange edges for the sleeves under a brown blazer in arrow-like patterns. She also wears a skirt with the same pattern as her shirt in her Style A, and a white headband adorned by two "autumn" leaves clipped to it. To complete her look, she wears brown moccasins with orange stitches, yellow laces, and black soles. This outfit was intially introduced as Sienna's Style B in Papa's Bakeria, but has remained her Style A since Papa's Sushiria.

verybadimagenegative_v1.3, ng_deepnegative_v1_75t, (ugly face:0.8),cross-eyed,sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, bad anatomy, DeepNegative, facing away, tilted head, {Multiple people}, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worstquality, low quality, normal quality, jpegartifacts, signature, watermark, username, blurry, bad feet, cropped, poorly drawn hands, poorly drawn face, mutation, deformed, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, extra fingers, fewer digits, extra limbs, extra arms,extra legs, malformed limbs, fused fingers, too many fingers, long neck, cross-eyed,mutated hands, polar lowres, bad body, bad proportions, gross proportions, text, error, missing fingers, missing arms, missing legs, extra digit, extra arms, extra leg, extra foot, ((repeating hair))