This is an awesome coloring page! The man in the center of the page looks like a mysterious figure in a grey suit and black cape, with a black mask covering his eyes and a Batman symbol on his chest. Behind him stands a large pile of Lego blocks ready to be assembled. To make the man appear powerful, I would color his clothes a steely grey and his cloak a deep black. The Batman symbol can be a bright yellow, while his mask and the blocks should be a popsicle pink. That way the colors will create a strong contrast and help the man stand out in the picture. To make it even better, I would use some white paint to outline the edges of the blocks to make them look more prominent. All in all, this coloring page is really fun and engaging, and it'll definitely make for a beautiful piece of art!