Unlock Numbers: Junior Abacus & Brain Development Course

Create a vibrant book cover illustration for a children's abacus course titled "Junior Abacus & Brain Development Course." The target age group is 5 to 8 years, so the design should feel fun, friendly, and colorful. Show happy children learning or using an abacus with bright, large, colorful beads. Include playful elements like stars, math symbols (+, −, ×, ÷), and brain graphics to represent cognitive development. The title should be in bold, playful fonts, with a cheerful color scheme in shades of blue, yellow, and red, creating an inviting and engaging look for young learners.