What do we commonly refer to as children's books?

Children's books cover books for ages 0 to 18. Therefore, YA (young adult) books also fall into the children's book category.

It will be clear whether your book is for children or teenagers. But let's look at some more specific subcategories.

Below is a list of age groups and the different kinds of books for them:

Newborn to age 4: Picture books in the form of board and soft books
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Ages 2–5: Early picture books

Ages 5–8: Picture books, coloring, activity and novelty books

Ages 4–8: Early readers

Ages 6-9: First chapter books and graphic novels

Ages 8–12: Middle-grade novels and graphic novels

Ages 12-18: Young adult (YA) novels and graphic novels

* Nonfiction books also exist for all these age groups

Stories, word counts, and book types vary by age, but most illustration styles are suitable for all ages. So your options are varied. Young adult books rarely include illustrations (especially on covers), but they may include them.

Above all, I like books that contain lessons and touching stories that anyone can read comfortably in their own style. Below is an example of a children's book by Maira Kalman.

* Maira Kalman: She is an American artist, illustrator, writer, and designer known for her painting and writing about the human condition. She is the author and illustrator of over 30 books for adults and children and her work is exhibited in museums around the world.

Below is Maira Kalman's adult book :

​Her illustrations have been frequently featured in the New York Times, and her writings and pictures are uploaded in the form of an illustration blog, giving readers special emotion and fun. She also writes articles and columns with political content on 'the right to pursue happiness'.

​When you look at her paintings, you don't think that children's books are that complicated and difficult. It's not that her skills are lacking, it's that she's a great professional and even though she's good at drawing, she puts her best foot forward and shows the message she wants to convey. In other words, you can create a good children's book if you think about how to convey the message you want to convey to each age group.

First, create your own pattern like below, and select with direct selection tool. 

Go to Object---> Pattern---> Make.

You can adjust the location, space and edit your pattern shape. 

After that, you have to click the 'Done' on the top of banner. 

Go to Swatches palette and click the pattern. 

And select the rectangle tool for checking your pattern. 

Here is your pattern sheet!

Here is the way how to create  sphere with your own letters in Illustrator.

First, draw a line with stroke size 8 and duplicate it with option key like the right.

Click the blend tool on the left toolbar and click on the line exactly between the two lines turn after turn. 

If you can doubleclick on the tool icon and you can adjust the number of specified steps.

And then go to object---> expand.

Next, make a new layer for creating your letters. 

After writing your letters, go to Object---> Expand. 

Flat your two layers to make a symbol.

Dump your image to the symbols palette like below and select the static symbol and graphic.

You can see the new added the symbol, you made by yourself. 

Then make a circle by using a circle shape tool. 

Click with a direct selection tool and select the half side and delete it. 

Go to Effect---> 3D(Classic)--> Revolve(classic) like below. 

After then, you can choose right edge and click the Map Art. 

Select the symbol, you made in advance.

And then click the scale to fit to adjust the appearance. 

You can also rotate it by using the options

Here is the result. 

Here is the process how to make a cube with illustrator.

First, draw a rectangle with a shape tool. 

Duplicate a rectangle with Option key and place it like a intersection.

Draw a line for connecting between rectangles like below.

And go to Object ---> Expand. 

Next, you can make a surface by using a shape builder tool to combine the complicated lines. 

And change the color !

Here is the way how to create an above 3 dimensional logo in Ilustrator. 

First, draw a line by using one of shape tool on the left toolbar.(select a line)
And then with option, you can duplicate the same line.

Click the blend tool on the left toolbar and click the line exactly. After then, you can check if it has other lines between bonded lines. 

If you need more lines between them, you have to double click on the blend tool. Open the options box and go to Specified steps with 8 and then click the O.K!

For making it a symbol, you have to go Object---> Expand.

If you click the lines you made previously with the selection tool and then dump them into the Symbols' palette, you can see the below box. 

You have to click the Graphic and Static symbol to make it symbol.

You can make sure it is on the symbols below.

Next, draw a circle by using a circle shape with click a shift key for making exact circle like below and then make it only color without the stroke. 
After then, you can click the direct selection tool for deleting the half side of the circle. 

Then go to Effect---> 3d(classic)--> Revolve(classic)

Choose the Right Edge---> click the Map Art 

Select the symbol, you made it previously and registered it on the symbol palette in advance. 

Then click the Scale to fit and invisible Geometry. 

Go to Object---> Expand Appearance.

To change the color, you have to do ungroup.

Go to Object ---> Expand. 

Ungroup again to seperate it with two sides.

Go to Release Clipping Mask. 

The it will be seperated like below.

You can change each colors, sometimes apply a gradient style on it. 

If it is ungroup condition, you can remove each part like below. 

Add the text and finish!