Photoshop brushes can be obtained from Adobe or other websites. You will find cool brushes in Photoshop & Photography Forums. Or you can create one.
I'll list a few of my favorite trusty resources below, so you can add a few to your arsenal and start to download Photoshop brushes. Before I check anywhere else on the internet, I generally check deviantART's Photoshop brush category. DeviantART is a large community of artists of all different skill levels.
There are hundreds, possibly even thousands of brushes for download on deviantART, and it's pretty easy to find the perfect one for your project. Many of the brushes you'll find on deviantART will be higher quality than those you'll pay for, they're always 100% free, and frequently (but not always) can be used for commercial purposes. There are a few requirements, though.
You'll need to make sure you sign up for a deviantART account - but don't worry, that's also free! You'll also have to read the artist's comments to make sure you know what rules they have for using their brushes. Lastly, it's considered good etiquette to provide a link back to the deviantARTist's profile if you use their stuff for any sort of public use.
After all, they did give you the brush to use for free. While the learning curve on their tutorials is a bit steep (all tutorials are intermediate-advanced knowledge of Photoshop), PhotoshopTutoirals.ws does provide a large amount of free-to-use textures, shapes, and brushes for Photoshop. These are all quite high quality, and I highly recommend them.
There aren't very many yet, as the website isn't very old.
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