The traffic rules only state that the driver should keep well within the lane boundaries (in the picture, the lane is the area between the yellow warning line and the white edge line). You may therefore freely choose your own position within the lane.

In a right-hand bend where visibility is obstructed, it is still advisable to position the car to the left in your lane (i.e. towards the yellow warning line), to get the best possible view ahead and make sure oncoming cars are more likely to see you approaching.