To learn how to create brushes yourself, it is very helpful to start by modifying existing brushes that are similar to what you want to achieve.
So here it would be advisable to download and install the archive Universe Environments - Lite Version from iForce73, and I recommend downloading the ABR files from JeffrettaLyn (I referred to both above), as you don’t need to convert them beforehand to use them, but you can also download her BMPs and convert them to PNG, but you may need to do some extra work for clipping objects. Then you have two sets of resources that are good to combine.
Let’s start with the installation of the set from iForce73, the files from the “Brush Presets” folder are the brush presets, i.e. what you select in Krita from the “Brush Presets” docker to paint with, these files must be copied to the “paintoppresets” subfolder in Krita’s resource folder. You can do this classically via file manager and copy the brush presets to the %APPDATA%\krita\paintoppresets folder, or via Krita’s resource management, the same applies to the subsequent brush tips from iForce and JeffrettaLyn.
In the folder “UNV_Brushes” you will find the brush tips that belong in the subfolder “brushes”, so they should be copied to %APPDATA%\krita\brushes, or you can use the resource management to import these files. Then there are the folders “Planet Ring” and “High Resolution Planets”, in the archive of iForce73, which I copied myself into the subfolders “patterns” and “brushes”, whether you do this too, or whether you follow the enclosed e-book, I leave it up to you, I will not explain their use to you either, you will work this out for yourself over time, should you seriously pursue the goal of creating your own space brushes.
So, now the brush tips from JeffrettaLyn in ABR format, which you can import in different ways, either you copy the ABR file(s) into the “brushes” folder, or you import them via the resource management in Krita, i.e. via ‘‘Settings’’ >> ‘‘Manage Resources…’’ >> ‘‘Import Resources’’.
I would also like to recommend the two programs “abrViewer.NET” and “abrMate” for handling ABR files. Although Windows programs, both run via Wine under Linux and probably also via WineBottler under macOS. Both do almost the same thing, display ABR files and extract their contents if required. However, “abrViewer.NET” is significantly faster, especially when extracting and displaying, and extracting is done automatically in the background, but “abrViewer.NET” cannot handle all ABR files AND THE ABRs THAT “abrViewer.NET” CANNOT READ, KRITA CANNOT READ THEM, and this is where “abrMate” comes into play, because “abrMate” can convert these ABR files into a format readable by Krita and “abrViewer.NET” (except copy-protected and corrupt ABRs and ABRs containing so-called artistic brushes (whatever that is in Photoshop)).
Now that you have imported all the files into Krita, you can start assigning suitable brush tips from JeffrettaLyn’s ABR files to individual brush presets from iForce73’s range of brushes and vary their settings to create a brush with new properties.
This means, for example, working with the “Spacing” at the beginning. Just take a brush and after pressing F5 to get into the brush editor, start playing with the settings, see what leads to what, assign other brush tips, be a kid. And as long as you don’t save it, you won’t break the brush you’re experimenting with, and if you like your changes, you can make them your first custom brush with the “Save New Brush Preset” button at the top right.
So, now, in addition to my post above, you know, at least I hope you know, how to import brush-presets and brush-tips into Krita and where you can play with them, the brush-editor, now it is up to you and your curiosity, your will to play, what will emerge from it. Maybe you noticed different file-types while importing the brush-tips and try to find out what the heck are GIH-brush-tips (and more GIH, and more, and more), and if you want to know more about Krita’s brush-engines, look here.
In case of questions, ask, therefor this forum exists, but the way to learn is playing and turning every screw available to see what happens next, which consequences it has, so turn them one after the other and see what happened or not.
And you really should see this video-series on how to make and manipulate brushes:
Michelist