Trevor Millum (1975) identified male facial expressions:

1. Carefree: nymph-like, active, healthy, gay, vibrant, outdoor guy, often smiling or grinning
2. Practical: concentrating, engaged on the business in hand, mouth closed, eyes object-directed, sometimes a slight frown, hair often short
3. Seductive: similar to the cool/level look (indifferent, self-sufficient, aloof, confident, lips slightly parted, usually looking the reader in the eye), eyes shaded, confident, self-sufficient, may include a slight smile
4. Comic: deliberately ridiculous, exaggerated, acting the fool, pulling faces for the benefit of a real or imaginary audience, sometimes close to archness
5. Catalogue: neutral look, artificial, waxlike, eyes open wide, smile, look remains vacant, personality removed