Final answer:
After Picasso's blue period, he transitioned to cubism and started painting in a new style using geometric shapes and bold colors.
Step-by-step explanation:
After Picasso's blue period, where he expressed his feelings of melancholy and poverty through heavy, dark lines and melancholy hues of light and dark blues, he transitioned to a new phase in his art. When Picasso was no longer sad, he started painting in a style known as cubism.
In this style, he depicted objects and figures from multiple viewpoints, using geometric shapes and bold colors. An example of this is his painting 'Three Musicians' where he used flat abstracted geometric shapes and bright colors to represent three musicians.