Ferb and his mother stand proudly in front of a grand house. She is wearing a classic witch costume with a wide-brimmed hat, a long gown and is happily holding a broom. Ferb, on the other hand, is dressed as a fun and spooky skeleton. Both of them are smiling wide and enjoying their family outing.
I would suggest coloring the house in a bright and cheerful red, adding shutters and other details in a light blue. For Ferb and his mother, I would use a mix of gray, black and white to give them their skeletal look. I would also accentuate the witch’s gown and hat with a vibrant purple, or even a silvery-blue to add a bit of sparkle to the scene. A bright yellow or orange could be used to highlight their happy smiles. Finally, the background could be filled with a gradient of warm colors, such as orange, yellow and red, to make the scene really come alive.