The hair is usually cut short with curls over the head, as shown in the image to the left. This may show that Prince Siddharta cut his long hair when he renounced his patrimony. There is a projection on the skull called the ushnisha where the soul is supposed to be located. http://louiscjcsheehan.blogspot.com There is usually a tuft of hair (urna) that indicates predestination to enlightenment. Buddha usually wears a garment over his left shoulder with the fabric in stylized folds and a bare right shoulder. To learn about the way these garments were draped, see: "Prolegomena to the Study of the Buddha's Dress in Chinese Sculpture," by A. B. Griswold. Artibus Asiae, Vol. 26, No. 2 (1963), pp. 85-131.http://louiscjcsheehan.blogspot.com
For more on the iconography of the Buddha, see: "The Problem of Proportion and Style in Indian Art History," by John F. Mostelle. Art Journal, Vol. 49, No. 4, New Approaches to South Asian Art (Winter, 1990), pp. 388-394. "A Long Roll of Buddhist Images. III," by Helen B. Chapin and Alexander C. Soper. Artibus Asiae, Vol. 32, No. 4 (1970), pp. 259-289+291-306.
I must admit I started out to answer the question of why an ascetic like the Buddha would wind up depicted with the proverbial "Buddha belly". Unverified Internet searches suggest it may be a function of Chinese Buddhism, but Chinese Buddhas are not always fat and I don't think Indian-Nepali Buddhas are always thin.