Hello!
Install a new brush in GimpBrush!

Before we start, let's find out why gimp brushes are needed.
brushes for GimpBrush - it's an attribute not only for any designer or photographer, but for people who don't use GimpBrush every single day. Usually GimpBrush brushes are used for making pictures more beautiful. The same brush can create itself in different ways. If you use brush only one time, you will get one pattern. Using the same brush for few times will make more beautiful picture, not similar than previous.
In the worldwide web you can find lots of brushes. This variety allows you to understand will chosen brush be the best variant for one or another brush. You have a possibility to hide a lot of defects. For example, you detected a blink on one of angles. Using free gimp brushes helps you to create sunshine, making your photo more interesting. Okay, now let's find out how to install our brushes to GimpBrush.
First of all you have to choose most favorite brushes in the internet. Choosing one or another brushes require from you understanding the needed result. We recommend using sites with possibility of free download gimp brushes. Brushes must be free!
Download your brushes and save them on a desktop. This file must be unpacked - not to be in a .zip or .rar archive file.
To add a new brush, after either creating or downloading it, you need to save it in a format GIMP can use.
The brush file needs to be placed in the GIMP's brush search path, so that GIMP is able to index and display it in the Brushes dialog.
You can hit the Refresh button, which reindexes the brush directory. GIMP uses three file formats for brushes:
GBR
The .gbr ("gimp brush") format is used for ordinary and color brushes.
You can convert many other types of images, including many brushes used by other programs, into GIMP brushes by opening them in GIMP and saving them with file names ending in .gbr. This brings up a dialog box in which you can set the default Spacing for the brush. A more complete description of the GBR file format can be found in the file gbr.txt in the devel-docs directory of the GIMP source distribution.
GIH
The .gih ("gimp image hose") format is used for animated brushes.
These brushes are constructed from images containing multiple layers: each layer may contain multiple brush-shapes, arranged in a grid. When you save an image as a .gih file, a dialog comes up that allows you to describe the format of the brush. Look at The GIH dialog box for more information about the dialog. The GIH format is rather complicated: a complete description can be found in the file gih.txt in the devel-docs directory of the GIMP source distribution.
VBR
The .vbr format is used for parametric brushes, i. e., brushes created using the Brush Editor.
There is really no other meaningful way of obtaining files in this format. To make a brush available, place it in one of the folders in GIMP's brush search path. By default, the brush search path includes two folders, the system brushes folder, which you should not use or alter, and the brushes folder inside your personal GIMP directory. You can add new folders to the brush search path using the Brush Folders page of the Preferences dialog.
Any GBR, GIH, or VBR file included in a folder in the brush search path will show up in the Brushes dialog the next time you start GIMP, or as soon as you press the Refresh button in the Brushes dialog.
That's all! GimpBrush has downloaded file from chosen directory, saved it and executed! Now when choosing "Brush" instrument, you will see our brush at the end of the list.
Brushes can be changed by sizes and colors. If downloaded brush doesn't need no more, you can simply delete it from the list.
Brushes for Photoshop (.abr) – an arrows
GIMP version 2.4 or higher supports the Photoshop .ABR brush format!
Files must be copied to the directory /gimp-2.x/brushes/ (where x=version number) or /usr/share/gimp/2.0/brushes/.

Have a nice day and work!