"A captivating cover illustration featuring Doraemon, a friendly blue robot cat with a round body and red nose, standing cheerfully in front of a whimsical time machine. The background is a colorful, fantastical scene of various time periods blending together, with dinosaurs, castles, and futuristic cities. The title 'Doraemon and the Time-Traveling Treasure' is prominently displayed at the top in a fun and vibrant font. At the bottom, it reads 'Written by [Your Name]' in a smaller, complementary font."