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Creating Customized Brush Tips
Photoshop's painting engine gives you many choices for brush tips. Any good designer will tell you that no matter how many brush tips you have, you'll always want more. For example, you're working on a 100-year-old photograph, and you need a specific brush to add hair details to the blown-out areas of the image. It's a special type of brush that literally creates the illusion of wavy hair. Photoshop, in an effort to help keep you organized, gives you the ability to create your very own customized brush tips, and then save them later in organized sets.
Create a New Brush Tip
Open an image scan an item, or select any of Photoshop's painting tools and create a shape for a new brush tip.IMPORTANT
Since the color of a brush is determined when the brush tip is selected, create the brush tip using black or in shades of gray.
Select the brush tip using any of Photoshop's selection tools.IMPORTANT
Photoshop picks up any pixel information in the underlying layers, even white. If you want the brush to have a transparent background, make sure the areas surrounding the image show as transparent.
Click the Edit menu, and then click Define Brush Preset. 
Enter a name for the new brush preset.
Click ok Open the Brushes palette, and then scroll to the bottom of the list to access your newly created brush tip.Since the Define Brush Preset button picks up any background colors within the selection area, always create the brush tip in a black layer.
