Venus is the second planet from the sun. It is sand-colored like old parchment. It is 95 percent of Earth's diameter and 80 percent of Earth's mass. It is an "inferior" planet, meaning it is closer to the sun than to the Earth. This means, that when viewed from Earth, it goes through phases and has a dark side which is not facing the sun. When drawing Venus, the important things to keep in mind are its size (if its a scale drawing), its color and its dark and light sides.
Start with a black background. You can add a few starts if you choose.
Outline a circle. If this is a scale diagram, the diameter of the Venus circle should be 95 percent of the diameter of the Earth circle.
Color Venus in using a sandy, off-white color. The color comes from thick clouds of sulfuric acid, so draw a spiral, cloudy pattern. Depending on where the sun is, you don't necessary have to color the whole thing. Don't color it in any shape that the moon doesn't take -- use full circles, half circles, crescents, or gibbous shapes.
Remember not to put any stars in the black space in the dark side of the planet. If a star was there, you could not see it because the planet would be in the way. This is a surprisingly common error people make when drawing crescent moons.