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There are 3 main types of noses - Caucasian, Asian or Oriental and African. The Asian nose has characteristics between those of the Caucasian and African. Today one increasingly finds mixed features between these groups as well so some individuals can have a Caucasian tip with an African bridge or vice versa. The most visible difference is the more vertical nostril alignment with a longer strip of skin between the nostrils in the Caucasian nose vs. the Asian or African nose. The Asian and African nasal bridges are flatter and broader than the Caucasian. In some cases the bridge may be so flat that it appears scooped out or ski sloped. The nasal tip skin is usually thicker with a more rounded tip in the Asian and African noses. The thinner nasal tip skin in the Caucasian nose makes the tip cartilages and their shapes more visible on external viewing. 
As you can see in the above diagram these differences are due to differences in the skin but mostly due to differences in the underlying bone and cartilage. In Asian and African noses:
