Change in the price of the good results in the movement along the same demand curve.
Factors other than price results in the shift in demand curve.
A rightward shift in demand would increase the quantity demanded at all prices compared to the original demand curve.
While a left shift indicates decrease in demand.
In the given graph , there is a rightward shift of the demand curve from left to the right ( D1 to D2), Thus we can say that there is an increase in demand.