How to describe facial features to LLM chatbots ? - AI Prompt Engineering

Describing facial features and head details to LLM models is similar to how you need to describe that to an artist. It’s essential to be precise and use specific terminology. What you need is to combine observation with precise vocabulary.

Facial features 🔗

Face shape 🔗

Describe the overall shape of the face, such as oval, round, square, heart-shaped, triangular, diamond, or long.

Forehead 🔗

high, low, sloped, flat, rounded, broad, narrow, prominent brow ridge forehead.

Eye shape 🔗

Specify the shape of the eyes, including the angle of the outer corners (upturned, downturned, or horizontal), and the shape of the eyelids (almond, round, or hooded).

Eye size 🔗

Describe the size of the eyes relative to the face, such as large, small, or average.

Eyebrow shape 🔗

Specify the shape and thickness of the eyebrows, including arched, straight, or curved.

Nose shape 🔗

Decribe the shape and size of the mouth, including full lips, thin lips, or a Cupid’s bow.

Jawline 🔗

Describe the shape and definition of the jawline, including sharp (prominent), soft, angular, square, rounded, pointed, wide, or narrow.

Chin 🔗

Pointed/pointy, rounded/round, strong, cleft, or recessed chin.

Head details 🔗

Head shape (skull) 🔗

Describe the overall shape of the head, including the proportions and angles.

Hairline 🔗

Specify the shape and recession of th hairline, including high, low, or average.

• hairline shape: widow’s peak, straight, uneven.
• hair texture: straight, wavy, curly, coiled.
• thickness and length
• parting: center, side, or none.
• hair color and highlights if needed, including natural tone, highlights, dyed, .. etc.

Facial proportions 🔗

Describe the proportions of the face, including the ratio of the forehead to the rest of the face.

Bone structure 🔗

Specify the prominence and shape of the cheekbones, nose, and jawline. High or low cheekbones. Fullness of cheeks: sunken, plump, defined. Face symmetry : balanced or asymmetrical.

Ears 🔗

Include:

• size and visibility (tucked or sticking out)
• attached or dettached earlobes.
• any piercings or unique features.

Skin texture 🔗

Describe the texture and tone of the skin, including smooth, wrinkled, or acne-prone.

• complexion: fair, olive, tan, dark.
• skin texture: smooth, freckled, wrinkled, scarred, blemished.
• age-indicative features: laugh lines, crow’s feet, .. etc.

Specific details 🔗

Eye details 🔗

Describe the color, shape, and size of the pupils, irises, and eyelashes.

• shape: almond, round, hooded, monolid, downturned, or upturned.
• size: large, small, average.
• set: wide-set, close-set, deep-set, or protruding.
• eyebrows: thick/thin, arched/flat, straight/angled, and their distance from the eyes.

Nose details 🔗

Specify the shape and size of the nostrils, bridge and tip.

• nose length and width.
• bridge: straight, curved, high, flat.
• tip: rounded, bulbous, pointed, upturned.
• nostrils: flared or narrow.

Mouth details 🔗

Describe the shape and size of the lips, Cupid’s bow, and philtrum.

• lip fullness: thin, medium, or full.
• lip shape: bow-shaped, heart-shaped, straight.
• expression lines, dimples, or downturned corners.

Facial expressions 🔗

Specify the emotions or expressions you want the face to convey, such as happy, sad, or neutral.

Artistic style 🔗

Style 🔗

Describe the artistic style you’re aiming for, such as realistic, cartoonish, or stylized.

Line work 🔗

Specify the type of line work you prefer, including bold, delicate, or expressive.

Shading and texture 🔗

Describe the desired level of shading and texture, including subtle, dramatic, or smooth.

Examples 🔗

Albert Einstein 🔗

Generate an image of a man with these facial features and head structure description.

Head shape: broad and slightly elongated, with a high, prominent forhead.

Jawline: soft and rounded, not sharply defined.

Chin: rounded and modest, blending smoothly into the jaw.

eyes: deep-set and thoughtful, often described as intense or contemplative.

eye shape: almond-shaped with noticeable under-eye bags, suggesting age and wisdom.

eyebrows: thick, bushy, and slightly arched - adding to his expressive look.

nose: prominent and slightly hooked with a defined bridge.

nostrils: subtle flare, but not overly wide.

lips: thin and often pursed, with a neutral or mildly amused expression.

mouth: framed by a thick, iconic mustache - gray-white and bushy.

ears: medium-sized and slightly protruding, visible from the front.

hairline: receding, especially at the temples.

hair: wild, unkempt, and voluminous - white or gray in later years, often standing out in tufts.

hair texture: wavy and frizzy, giving him a “mad genius” aesthetic.

skin tone: fair with a slightly ruddy undertone.

texture: wrinkled, especially around the eyes and forehead.

other features of the skin and age features: deep laugh lines and crow’s feet, reflecting a life of thought and expression.

General examples and samples 🔗

• The head is oval-shaped with a strong, square jawline and a slightly pointed chin.
• She has wide-set almond eyes with thick, gently arched brows.

final words 🔗

By providing detailed descriptions of these facial features and head details, you’ll help the AI model generate a more accurate and nuanced representation of the human you described. Feel free to mix visual references with your descriptions if possible.

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