I totally agree with the statement that arts should be compulsory at school

Art classes should be compulsory in high school. Do you agree or disagree?

In my opinion, I totally agree with the statement that arts should be compulsory at school. There are two main reasons why I believe that arts are very useful in not only school but also daily life.

First of all, studying arts at school can help children to enhance their imagination and creativity. When children learn arts, they are free to express their own perspectives and interpretation of their own lives. This will help them think more flexibly and creatively. Additionally, due to the daily observation of objects during drawing, the child's brain will be boosted by the ability to observe and enhance memory, thereby nurturing the imagination.

Secondly, stress reduction is also a reason why arts should be made compulsory at school. Decades of studies have suggested that learning arts can help learners to be more relaxed. Moreover, art also helps children more in love with life when they see life through the eyes of the artist and let their souls into the painting.

Thirdly, arts make our life more vivid. Learning arts can make our life more vibrant. When learning arts, we can gain new friends and relationships. And if you are a bit talented in art, you will be admired by a lot of people. Finishing a portrait or a landscape and use it as furniture in your house can make your life more light and full of spirit.

In summary, I think that arts should be introduced as a compulsory subject at school

The formatting of this sentence should have been divided into 2. Rather than saying there are 2 main reasons, present the reasons individually in a manner that provides an overview of the topics within the school and personal settings. Such a presentation would have added clarity and coherence to the succeeding paragraphs. That said, I must commend the writer for the creative prompt restatement.

Do not go beyond 2 reasons.The prompt isa standard 4 paragraph presentation, with a 2 paragraph reasoning allotment. It is the entry of the 3rd reason, which could have been easily merged with the second paragraph that led to the under discussed second paragraph. Without this error ,the essay would have been in a better place for a higher score since the essay only has negligible errors.

P.S. Aim for a 2 sentence conclusion as required next time.

Is it your IELTS WRITING practice? If this is for IELTS, I believe that you should write four paragraphs for a writing.
For the first paragraph, to begin with, paraphrasing the question is needed. In this case, ART CLASSES SHOULD BE COMPULSORY IN HIGH SCHOOL, you can rewrite it: "There are different views on whether subjects related to art should be taught compulsorily in high school." And then, you can write like you has just done.

Finishing a portrait or a landscape and USING it as furniture in our house can brighten/ lighten our life, full of spirit.
Try not to use "YOU, YOUR" in an IELTS writing or Academic Writing (My professor said so)

Actually, you used the phrase "help sb (to) do sth" many times but it is not a really good phrase.
First of all, studying arts at school can help ...
Studying arts at school can be a great way to enhance...
art also helps children ... can be rewritten: thanks to art, children become more in love with life

Those are my recommendation, I wish it would help.

This is for written test in IELTS ? if yes, in opening sentence you mention two main reasons but in explanation below you was explain thirdly reason