Alex is dancing happily in a vibrant Minecraft world. His blue shirt pops against his tan pants and his dark hair brushes against his forehead. He is standing on a block of dirt, surrounded by green grass, with a smile that looks as if it could light up the night sky. To fully bring Alex's excitement and joy to life, I would suggest using a variety of blues and greens to color in Alex's clothing and the variety of shades in the grass. To make him stand out, I would add a lighter yellow for his hair and a reddish pink for his shirt. Finally, I would use a bright yellow for his smile to really bring out his joy.