Alice sits at a table, wearing a playful blue dress. The Hatter sits across from her, wearing a bright green top-hat and a purple waistcoat. Alongside them, the March Hare stands, pouring tea for the two. Alice has a cup of tea in hand with a content and curious expression, while the Hatter holds an empty cup with a mischievous look on his face. On the table, a steaming teapot rests amongst a variety of colorful saucers and plates.
For this picture, I would suggest creating a vivid color palette using blues, purples, greens, and yellows. Use the blues in Alice's dress and the teapot to provide a calming base and the greens, purples, and yellows to give the bright and whimsical feel of the characters. Give the March Hare a calming yellow hue, the Hatter a mischievous green to match his top-hat and waistcoat, and Alice a curious blue. This can bring vibrant and whimsical energy to the image while also highlighting each character's individual personality.