It will be a lot of fun coloring this picture. You can use a lot of colors while coloring this religious picture of Jesus giving a sermon on the mount. Think of Jesus and the colors used in Church in scriptures of Jesus and color the picture accordingly. You can start with coloring the mountains. Mountains are mostly of either of mud color or can have green color showing grass. You can use any of the colors. Then color the sun yellow and clouds blue. After that you can start coloring the people. Coloring their faces with a light peach or yellow will make their skin look realistic, and then color their beards and hair with red and brown shades. Color their cloths with light shade of colors and color the tree behind the mount in green. This will make this picture look very perfect and beautiful.