Black-and-white Minimalist Hand-drawn Character Portrait Grid

A black-and-white minimalist hand-drawn character portrait grid, strictly 6 rows by 4 columns, totaling 24 portraits, evenly arranged on a white background. Key structure: each portrait is framed within a square cell, with the four sides of the square serving as the facial contour boundaries. The face fits tightly against the square edges, with no extra margins. Style features: pure black-and-white line illustration, no filled color blocks, no shading, no gradients. Hand-drawn texture, slightly irregular lines, naive and whimsical editorial illustration style. Minimalist facial 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 outlined with lines: wavy bangs, curly hair lines, center-parted curtain bangs, flat top short lines, side-swept bangs, spiral curls, striped hair, scalloped bangs. Some characters have round glasses, square glasses, beards, freckles, closed eyes, X-shaped eyes. Various expressions: happy, sad, confused, sleepy, surprised, expressionless. Overall style resembles a hand-drawn character catalog: geometric, restrained, naive but not loose, flat, high contrast, no color, no background decoration, no realistic details. Insert discreet watermark in the lower right corner of the image, vertical text (rotated 90°), written "aipromptlabs.online", Calibri Light font, white color with low opacity (semi-transparent), medium size. Extreme sharpness on the face, fabric texture and typography of the letters. Shot on Canon EOS R5, 50mm f/2.8, studio light.