In this section we will introduce you how to create rainbow illustration in Illustrator. Rainbow is usually associated with water such as rain and fall and gives us a really refreshing impression.
Rainbow illustration gives warm impression. You can combine it with other illustrations such as ladybird.
Draw 2 precise circles using [Eclipse Tool] like the image above. Overlap the midpoints using [Object Order]. [Fill: No/ Line: Yes].
Create 6 circles between the 2 circles using Blend Tool.
Go to [Object > Blend > Blend Option] and set up as shown above. Do [Object > Blend > Create Blend]. Now we have 6 circles in between.
Go to [Object > Divide/Expand] and set.
It looks as if you have 8 circles, in fact, you only have 2 circle objects. In order to be able to edit the circles, objectify the 8 circles using <Divide/Expand>.
Select the half bottom of the circle using [Direct Selection Tool] and remove it using the <Del Key> to make a hemisphere. Now you have a rainbow shape.
You cannot yet color this so draw lines at the ends of the rainbow with [Pen Tool]. Select each end and do [Object Order].
If you cannot do it with one line, try drawing multiple lines.
This is one object with 8 lines. Objectify it into 7 objects using [Pathfinder > Divide]. Now you have a rainbow bridge.
Dividing might mess up the layer orders. Sort them by moving the bigger circles on top. If the black lines make it inconvenient to see, do this step in the next step.
Click the bottom line of the rainbow, set the fill color and select [Line: No]. Now you have a complete rainbow illustration but we will have some more twists.
Set Blend Option, apply gradation on the two inside parts of the rainbow.
Unlike smooth gradation, you have a rough gradation.
Next, apply gradation on the blue and light blue using Blend. Do the same with the rest and you will have beautiful rainbow gradation.
Now you have a rainbow Illustration. This is a little tricky but this layered rainbow gradation makes a beautiful illustration. Now gradational rainbows are also cute. Choose the type depending on your preference.
Rainbow illustrations are often associated with other illustrations. Choose one that fits into the image as a whole.