A black-and-white minimalist hand-drawn portrait avatar grid, strictly 6 rows by 4 columns, 24 avatars in total, evenly arranged on a white background. Key structure: each avatar is framed by a square cell, and the four sides of the square are themselves the boundary of the face's outline. The face hugs the four sides of the square with no extra margin. Style: pure black-and-white line illustration, no color fills, no shadows, no gradients. Hand-drawn texture, slightly irregular lines, a naive and quirky editorial illustration style. Minimalist features: dot eyes, small circle eyes, short-line eyebrows, tiny dot nose, straight-line mouth, small smile, small sad mouth, sleepy eyes, surprised O-shaped mouth, expressionless face. Hairstyles sketched in lines: wavy-line bangs, curly-line hair, center-parted curtain hair, flat short-line cut, side-swept bangs, swirl curls, striped hair, scalloped bangs. Some characters have round glasses, square glasses, a mustache, freckles, closed eyes, X-shaped eyes. Varied expressions: happy, sad, puzzled, sleepy, surprised, expressionless. The overall style resembles a hand-drawn character compendium—geometric, restrained, naive but not loose, flat, high contrast, no color, no background decoration, no realistic detail.