佳

Left person radical - the side-stacking form of 人. Pictures a standing figure in profile. Anchors 佳 in human-quality words: a person who is fine / excellent, hence the meaning 'good, beautiful, admirable'. Same family: 优 (excellent), 俊 (handsome), 健 (strong).

Right 圭 supplies the sound - guī drifted to jiā, an irregular but historically attested shift. 圭 is a ceremonial jade tablet (two 土 stacked, an etched stone of rank), so the right side also faintly suggests preciousness - fitting for a 'fine' person. Same phonetic family: 街 (street), 蛙 (frog), 挂 (hang).