1. Getting direction from professionals
Art school teachers are professionals who can be really beneficial to you and your burgeoning career. If you don't have this expert instruction, you could spend ages working out what you want to do and how to go about it: professionals can guide you down the path you should be going down. They can use their own experience and expertise to help you make the best decisions about where you're going as an artist. If you don't go to art school, you've got a lot of decisions to make; if you do go, you're going to get help making them.
2. Getting taught by professionals
One of the best things about art school is getting taught the ways of the craft by professional artists. There's only so much you can learn from books or from websites - having an experienced artist teach you is invaluable because you get to have your questions answered by an experienced professional. What professional and experienced art teachers can teach you is things that you might not so easily find online or in books. Having professionals in regular contact is also a great way of keeping you motivated and encouraged to be more productive and do better.
3. Building up contacts
Going to art school is a great way of building up contacts. While there, you're able to build up a network of contacts that includes your fellow students and your teachers. There are also lots of events on throughout the year - gallery exhibitions, for example - that are another great way of adding contacts to your list. One of the best things about going to art school is being able to build up a list of contacts you might not be able to if you don't go to art school.
4. Being able to showcase your work
Throughout your time at art school, you'll not only get to develop your skills, but you'll also get to showcase your work to others. Your teachers and fellow students will get to see your work. What's great is that they'll also help you by offering advice and giving critiques. What's even greater is that they might buy your work, or they might know someone who would want to buy it. There are all sorts of events throughout the year that give you the opportunity to showcase your work to the public - again, a great opportunity to sell your work.
5. Giving you time
With art school, you've got a lot of time you can devote to art because it's your focus. Many artists who don't go to art school can't put much time aside for art because they have to spend most of their time working to cover their living costs; going to art school is great because it gives you time to hone and develop your skills. You're required to devote lots of time to your art: with more time, you can learn more techniques and different styles of painting. You've also got the opportunity to produce a lot more art, which can be really beneficial if you manage to get it sold.