One of my favorite tools in Photoshop has to be the brush tool. Download brushes from the following sites to make your artwork look better.
To install, place the downloaded ABR-file in the correct Presets folder of Photoshop. With default install-settings, this folder can be found in C:\Program Files\Adobe\Adobe Photoshop\Presets\Brushes.
- VBrush
Photoshop 7 brushes. Still worth mentioning. - Appendixsquared
A couple of brushes. Brushes will work on Photoshop CS2 or higher. - Brusheezy Recommended
Great website with a huge amount of brushes. Easy browsing and nice previews. - In Obscuro
Photoshop 7 brushes. Nice brushes in this collection. - DaviantART Recommended
Huge amount of brushes, created and submitted by other designers. All kinds of styles.