Japanese Box Lunch キャラ弁

Now she is in a attends middle school, so I give gave up making kyara-ben for her.

(It's a sorrow so sad!)

The original sentence was technically correct, but it's more common and casual to say "It's so sad!"

Since my daughters had events in their nursery and school on the same day last month, I made their box lunches.

Last month is a relative term, you only add "in" if the time is specific. Ex: the same day in January.

I like making kyara-ben, a Japanese box lunch which has some characters and other entertaining things inside, so I referred to my favorite cookbook.

When you want to describe/explain more about an object, use this form:

I have an [OBJECT],[DESCRIPTION],that I want to give to my friend.

This will keep the sentence clear because readers can cover up the description without changing the meaning of the sentence.

We usually "consult" a professional, not a book. Ex: Consult a teacher; consult a doctor. Instead, we refer to a book for guidance.

I selected キイロイトリ from リラックマ.

I don't know what the Katakana means, so I can't correct this

The first picture is my youngest daughter's bento.

Your sentence will mean "The first picture is my daughter's picture", so you have to be specific.

She said she liked it and finished it before she came home.

Original sentence means: She only liked the bento when she came home.

Since you actually mean: She liked it. She finished it before she came home.

You join the two separate sentences with "and".

The second picture shows my eldest daughter's one.

In this case it is correct to use "one", because the second picture shows [something].

She said she liked it, but she ate it while hiding from her friends because it looked childish.

She is in a middle school now, so I stopped making kyara-ben for her.

"give up" is extreme, so "stopped" is better.

(It's a sorrow!)

Do you mean "What a pity"?

The last picture is the bento for my husband.

The picture is still showing the bento for your husband, so you say the picture IS.

It had no character but I used the rest of nori, Japanese seaweed, for his rice balls.