Watercolor is a medium of flow and flexibility. Most watercolor artists usually have to be pretty loose at the early stages of watercolor due to the unpredictability of water and how it will flow. Towards the end as we layer, we can finally add details and create a more defined and detailed artwork. When we use ink, it helps us to create fine lines and shapes without having to wait for a certain amount of layering to happen and gives those who wishes to have a more structured way of painting control it better.