By THHT 
How to Draw a Rainbow cute and easy with this how-to video and step-by-step drawing instructions. Cartoon drawings for beginners and kids.
Please see the drawing tutorial in the video below
You can refer to the simple step-by-step drawing guide below
Step 1
First we draw two parallel arcs. Place these arcs in the center of the piece of paper or where you want to draw the rainbow if you’re drawing an entire landscape.
Step 2
Add two more arcs to our drawing. All lines should be perfectly parallel as you can see in our sample. If you are unsure of your ability to work with baselines, it is recommended to use very light erasable strokes.
Step 3
In fact, this drawing tutorial will be quite monotonous. We hope that you can overcome the boredom because you will get an excellent result in the end. Meanwhile, we draw two more parallel arcs.
Step 4
We repeat the same action one last time. It’s a good practice to draw parallel lines, isn’t it? As a result, we will get eight stripes in the form of arcs. This is a good base for drawing rainbows.
Step 5
A big rainbow in the sky doesn’t happen without rain. That’s why in this step we’re going to draw some clouds at the end of our rainbow.
Step 6
Finally to make the rainbow picture come to life we draw cute cartoon faces for the clouds on the sides.
Step 7
We don’t think it’s necessary to ask what color the rainbow should be painted. There is a lot to remember for this. For example here is Roy G. Biv (red, orange, yellow, green, blue, indigo, violet).
HAN