6454421 is the part and color combination code (or ElementID) for this part in Light Nougat color.
Minifigure, Head Dual Sided Black and Dark Bluish Gray Bushy Eyebrows, Nougat Eye Shadow and Lower Lip, Medium Nougat Cheek Lines and Wrinkles, Lopsided Scowl with Tooth / Angry Frown Pattern - Vented Stud