Nature determines features and characteristics that may be inherited by you because some of your ancestors were endowed with the same features and characteristics. For example, if your grandparent and great grandparent were artists, the likelihood of you developing into a fine artist is more. This is because you inherit the properties or characteristics of your ancestors talents in matters relating to arts and also, of course, physical characteristics.
Nurture depends on environment. However, scientists now understand the concept of epigenetics. Our genetics can be altered by our environment. This was graphically illustrated by the effect of the Dutch famine on the grandchildren of women who were affected by the famine in Holland during World War 2. Scientists now understand that genes are affected by the environment and can be methylated and changed by the environment. The answer is not simple, both nature and nurture affect the phenotype of genes.
Nature is the genes we inherit and nurture is how the environment affects their phenotype.