There are thousands of Photoshop brush directories online and hundreds of thousands of brushes- most of which are great to look at and even better to use. The vast majority of brushes are free to use for personal projects. Commercial use is where the rules differ. Some sets require you to buy a license; others merely ask that you request permission to use the art commercially.
But if you don’t want to pay and are too antisocial to contact people through email to ask them a question, there are some brushes …