This frog looks so happy! I would color the frog green, with dark spots for a realistic look. I would make the eyes big and black, and the tongue pink. The lily pad would be colored green with yellow spots - be sure to blend the colors together so that they look natural. Finally, the water around the frog would be a deep, cool blue. Be sure to add plenty of detail and life to the image so that it looks very realistic. Enjoy coloring!